snort-rules-default 2.9.7.0-5 / etc / snort / rules / ftp.rules

# Copyright 2001-2005 Sourcefire, Inc. All Rights Reserved
#
# This file may contain proprietary rules that were created, tested and
# certified by Sourcefire, Inc. (the "VRT Certified Rules") as well as
# rules that were created by Sourcefire and other third parties and
# distributed under the GNU General Public License (the "GPL Rules").  The
# VRT Certified Rules contained in this file are the property of
# Sourcefire, Inc. Copyright 2005 Sourcefire, Inc. All Rights Reserved.
# The GPL Rules created by Sourcefire, Inc. are the property of
# Sourcefire, Inc. Copyright 2002-2005 Sourcefire, Inc. All Rights
# Reserved.  All other GPL Rules are owned and copyrighted by their
# respective owners (please see www.snort.org/contributors for a list of
# owners and their respective copyrights).  In order to determine what
# rules are VRT Certified Rules or GPL Rules, please refer to the VRT
# Certified Rules License Agreement.
#
#
# $Id: ftp.rules,v 1.57.2.7.2.6 2005/07/22 19:19:54 mwatchinski Exp $
#----------
# FTP RULES
#----------


# protocol verification
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP MDTM overflow attempt"; flow:to_server,established; content:"MDTM"; nocase; isdataat:100,relative; pcre:"/^MDTM\s[^\n]{100}/smi"; reference:bugtraq,9751; reference:cve,2001-1021; reference:cve,2004-0330; reference:nessus,12080; classtype:attempted-admin; sid:2546; rev:5;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP XMKD overflow attempt"; flow:to_server,established; content:"XMKD"; nocase; isdataat:100,relative; pcre:"/^XMKD\s[^\n]{100}/smi"; reference:bugtraq,7909; reference:cve,2000-0133; reference:cve,2001-1021; classtype:attempted-admin; sid:2373; rev:4;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP NLST overflow attempt"; flow:to_server,established; content:"NLST"; nocase; isdataat:100,relative; pcre:"/^NLST\s[^\n]{100}/smi"; reference:bugtraq,10184; reference:bugtraq,7909; reference:bugtraq,9675; reference:cve,1999-1544; classtype:attempted-admin; sid:2374; rev:6;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP ALLO overflow attempt"; flow:to_server,established; content:"ALLO"; nocase; isdataat:100,relative; pcre:"/^ALLO\s[^\n]{100}/smi"; reference:bugtraq,9953; classtype:attempted-admin; sid:2449; rev:1;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP RNTO overflow attempt"; flow:to_server,established; content:"RNTO"; nocase; isdataat:100,relative; pcre:"/^RNTO\s[^\n]{100}/smi"; reference:bugtraq,8315; reference:cve,2000-0133; reference:cve,2001-1021; reference:cve,2003-0466; classtype:attempted-admin; sid:2389; rev:7;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP STOU overflow attempt"; flow:to_server,established; content:"STOU"; nocase; isdataat:100,relative; pcre:"/^STOU\s[^\n]{100}/smi"; reference:bugtraq,8315; reference:cve,2003-0466; classtype:attempted-admin; sid:2390; rev:4;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP APPE overflow attempt"; flow:to_server,established; content:"APPE"; nocase; isdataat:100,relative; pcre:"/^APPE\s[^\n]{100}/smi"; reference:bugtraq,8315; reference:bugtraq,8542; reference:cve,2000-0133; reference:cve,2003-0466; classtype:attempted-admin; sid:2391; rev:7;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP RETR overflow attempt"; flow:to_server,established; content:"RETR"; nocase; isdataat:100,relative; pcre:"/^RETR\s[^\n]{100}/smi"; reference:bugtraq,8315; reference:cve,2003-0466; reference:cve,2004-0287; reference:cve,2004-0298; classtype:attempted-admin; sid:2392; rev:7;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP STOR overflow attempt"; flow:to_server,established; content:"STOR"; nocase; isdataat:100,relative; pcre:"/^STOR\s[^\n]{100}/smi"; reference:bugtraq,8668; reference:cve,2000-0133; classtype:attempted-admin; sid:2343; rev:3;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP CEL overflow attempt"; flow:to_server,established; content:"CEL"; nocase; isdataat:100,relative; pcre:"/^CEL\s[^\n]{100}/smi"; reference:arachnids,257; reference:bugtraq,679; reference:cve,1999-0789; reference:nessus,10009; classtype:attempted-admin; sid:337; rev:12;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP XCWD overflow attempt"; flow:to_server,established; content:"XCWD"; nocase; isdataat:100,relative; pcre:"/^XCWD\s[^\n]{100}/smi"; reference:bugtraq,11542; reference:bugtraq,8704; classtype:attempted-admin; sid:2344; rev:3;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP CWD overflow attempt"; flow:to_server,established; content:"CWD"; nocase; isdataat:100,relative; pcre:"/^CWD\s[^\n]{100}/smi"; reference:bugtraq,11069; reference:bugtraq,1227; reference:bugtraq,1690; reference:bugtraq,6869; reference:bugtraq,7251; reference:bugtraq,7950; reference:cve,1999-0219; reference:cve,1999-1058; reference:cve,1999-1510; reference:cve,2000-1035; reference:cve,2000-1194; reference:cve,2001-0781; reference:cve,2002-0126; reference:cve,2002-0405; classtype:attempted-admin; sid:1919; rev:22;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP CMD overflow attempt"; flow:to_server,established; content:"CMD"; nocase; isdataat:100,relative; pcre:"/^CMD\s[^\n]{100}/smi"; classtype:attempted-admin; sid:1621; rev:10;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP STAT overflow attempt"; flow:to_server,established; content:"STAT"; nocase; isdataat:100,relative; pcre:"/^STAT\s[^\n]{100}/smi"; reference:bugtraq,3507; reference:bugtraq,8542; reference:cve,2001-0325; reference:cve,2001-1021; reference:url,labs.defcom.com/adv/2001/def-2001-31.txt; classtype:attempted-admin; sid:1379; rev:12;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP SITE CHMOD overflow attempt"; flow:to_server,established; content:"SITE"; nocase; content:"CHMOD"; distance:0; nocase; isdataat:100,relative; pcre:"/^SITE\s+CHMOD\s[^\n]{100}/smi"; reference:bugtraq,10181; reference:bugtraq,9483; reference:bugtraq,9675; reference:cve,1999-0838; reference:nessus,12037; classtype:attempted-admin; sid:2340; rev:7;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP SITE CHOWN overflow attempt"; flow:to_server,established; content:"SITE"; nocase; content:"CHOWN"; distance:0; nocase; isdataat:100,relative; pcre:"/^SITE\s+CHOWN\s[^\n]{100}/smi"; reference:bugtraq,2120; reference:cve,2001-0065; classtype:attempted-admin; sid:1562; rev:11;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP SITE NEWER overflow attempt"; flow:to_server,established; content:"SITE"; nocase; content:"NEWER"; distance:0; nocase; isdataat:100,relative; pcre:"/^SITE\s+NEWER\s[^\n]{100}/smi"; reference:bugtraq,229; reference:cve,1999-0800; classtype:attempted-admin; sid:1920; rev:6;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP SITE CPWD overflow attempt"; flow:established,to_server; content:"SITE"; nocase; content:"CPWD"; distance:0; nocase; isdataat:100,relative; pcre:"/^SITE\s+CPWD\s[^\n]{100}/smi"; reference:bugtraq,5427; reference:cve,2002-0826; classtype:misc-attack; sid:1888; rev:8;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP SITE EXEC format string attempt"; flow:to_server,established; content:"SITE"; nocase; content:"EXEC"; distance:0; nocase; pcre:"/^SITE\s+EXEC\s[^\n]*?%[^\n]*?%/smi"; classtype:bad-unknown; sid:1971; rev:4;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP SITE overflow attempt"; flow:to_server,established; content:"SITE"; nocase; isdataat:100,relative; pcre:"/^SITE\s[^\n]{100}/smi"; reference:cve,1999-0838; reference:cve,2001-0755; reference:cve,2001-0770; classtype:attempted-admin; sid:1529; rev:10;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP USER overflow attempt"; flow:to_server,established,no_stream; content:"USER"; nocase; isdataat:100,relative; pcre:"/^USER\s[^\n]{100}/smi"; reference:bugtraq,10078; reference:bugtraq,1227; reference:bugtraq,1504; reference:bugtraq,1690; reference:bugtraq,4638; reference:bugtraq,7307; reference:bugtraq,8376; reference:cve,1999-1510; reference:cve,1999-1514; reference:cve,1999-1519; reference:cve,1999-1539; reference:cve,2000-0479; reference:cve,2000-0656; reference:cve,2000-0761; reference:cve,2000-0943; reference:cve,2000-1035; reference:cve,2000-1194; reference:cve,2001-0256; reference:cve,2001-0794; reference:cve,2001-0826; reference:cve,2002-0126; reference:cve,2002-1522; reference:cve,2003-0271; reference:cve,2004-0286; classtype:attempted-admin; sid:1734; rev:30;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP PASS overflow attempt"; flow:to_server,established,no_stream; content:"PASS"; nocase; isdataat:100,relative; pcre:"/^PASS\s[^\n]{100}/smi"; reference:bugtraq,10078; reference:bugtraq,10720; reference:bugtraq,1690; reference:bugtraq,3884; reference:bugtraq,8601; reference:bugtraq,9285; reference:cve,1999-1519; reference:cve,1999-1539; reference:cve,2000-1035; reference:cve,2002-0126; reference:cve,2002-0895; classtype:attempted-admin; sid:1972; rev:16;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP RMDIR overflow attempt"; flow:to_server,established; content:"RMDIR"; nocase; isdataat:100,relative; pcre:"/^RMDIR\s[^\n]{100}/smi"; reference:bugtraq,819; classtype:attempted-admin; sid:1942; rev:6;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP MKD overflow attempt"; flow:to_server,established; content:"MKD"; nocase; isdataat:100,relative; pcre:"/^MKD\s[^\n]{100}/smi"; reference:bugtraq,612; reference:bugtraq,7278; reference:bugtraq,9872; reference:cve,1999-0911; reference:nessus,12108; classtype:attempted-admin; sid:1973; rev:9;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP REST overflow attempt"; flow:to_server,established; content:"REST"; nocase; isdataat:100,relative; pcre:"/^REST\s[^\n]{100}/smi"; reference:bugtraq,2972; reference:cve,2001-0826; classtype:attempted-admin; sid:1974; rev:6;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP DELE overflow attempt"; flow:to_server,established; content:"DELE"; nocase; isdataat:100,relative; pcre:"/^DELE\s[^\n]{100}/smi"; reference:bugtraq,2972; reference:cve,2001-0826; reference:cve,2001-1021; classtype:attempted-admin; sid:1975; rev:8;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP RMD overflow attempt"; flow:to_server,established; content:"RMD"; nocase; isdataat:100,relative; pcre:"/^RMD\s[^\n]{100}/smi"; reference:bugtraq,2972; reference:cve,2000-0133; reference:cve,2001-0826; reference:cve,2001-1021; classtype:attempted-admin; sid:1976; rev:9;)

alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP invalid MODE"; flow:to_server,established; content:"MODE"; nocase; pcre:"/^MODE\s+[^ABSC]{1}/msi"; classtype:protocol-command-decode; sid:1623; rev:6;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP large PWD command"; flow:to_server,established; dsize:10; content:"PWD"; nocase; classtype:protocol-command-decode; sid:1624; rev:6;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP large SYST command"; flow:to_server,established; dsize:10; content:"SYST"; nocase; classtype:protocol-command-decode; sid:1625; rev:6;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP CWD Root directory transversal attempt"; flow:to_server,established; content:"CWD"; nocase; content:"C|3A 5C|"; distance:1; reference:bugtraq,7674; reference:cve,2003-0392; reference:nessus,11677; classtype:protocol-command-decode; sid:2125; rev:8;)




# bad ftp commands
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP SITE ZIPCHK overflow attempt"; flow:to_server,established; content:"SITE"; nocase; content:"ZIPCHK"; distance:1; nocase; isdataat:100,relative; pcre:"/^SITE\s+ZIPCHK\s[^\n]{100}/smi"; reference:cve,2000-0040; classtype:attempted-admin; sid:1921; rev:5;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP SITE NEWER attempt"; flow:to_server,established; content:"SITE"; nocase; content:"NEWER"; distance:1; nocase; pcre:"/^SITE\s+NEWER/smi"; reference:cve,1999-0880; reference:nessus,10319; classtype:attempted-dos; sid:1864; rev:7;)

alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP SITE EXEC attempt"; flow:to_server,established; content:"SITE"; nocase; content:"EXEC"; distance:0; nocase; pcre:"/^SITE\s+EXEC/smi"; reference:arachnids,317; reference:bugtraq,2241; reference:cve,1999-0080; reference:cve,1999-0955; classtype:bad-unknown; sid:361; rev:15;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP EXPLOIT STAT * dos attempt"; flow:to_server,established; content:"STAT"; nocase; pcre:"/^STAT\s+[^\n]*\x2a/smi"; reference:bugtraq,4482; reference:cve,2002-0073; reference:nessus,10934; reference:url,www.microsoft.com/technet/security/bulletin/MS02-018.mspx; classtype:attempted-dos; sid:1777; rev:8;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP EXPLOIT STAT ? dos attempt"; flow:to_server,established; content:"STAT"; nocase; pcre:"/^STAT\s+[^\n]*\x3f/smi"; reference:bugtraq,4482; reference:cve,2002-0073; reference:nessus,10934; reference:url,www.microsoft.com/technet/security/bulletin/MS02-018.mspx; classtype:attempted-dos; sid:1778; rev:8;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP tar parameters"; flow:to_server,established; content:" --use-compress-program "; nocase; reference:arachnids,134; reference:bugtraq,2240; reference:cve,1999-0202; reference:cve,1999-0997; classtype:bad-unknown; sid:362; rev:12;)

# bad directories
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP CWD ~root attempt"; flow:to_server,established; content:"CWD"; nocase; content:"~root"; distance:1; nocase; pcre:"/^CWD\s+~root/smi"; reference:arachnids,318; reference:cve,1999-0082; classtype:bad-unknown; sid:336; rev:10;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP CWD ..."; flow:to_server,established; content:"CWD"; nocase; content:"..."; distance:0; pcre:"/^CWD\s[^\n]*?\.\.\./smi"; reference:bugtraq,9237; classtype:bad-unknown; sid:1229; rev:7;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP CWD ~ attempt"; flow:to_server,established; content:"CWD"; nocase; pcre:"/^CWD\s+~/smi"; reference:bugtraq,2601; reference:bugtraq,9215; reference:cve,2001-0421; classtype:denial-of-service; sid:1672; rev:11;)

# vulnerabilities against specific implementations of ftp
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP serv-u directory transversal"; flow:to_server,established; content:".%20."; nocase; reference:bugtraq,2052; reference:cve,2001-0054; classtype:bad-unknown; sid:360; rev:7;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP wu-ftp bad file completion attempt ["; flow:to_server,established; content:"~"; content:"["; distance:0; reference:bugtraq,3581; reference:bugtraq,3707; reference:cve,2001-0550; reference:cve,2001-0886; classtype:misc-attack; sid:1377; rev:15;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP wu-ftp bad file completion attempt {"; flow:to_server,established; content:"~"; content:"{"; distance:0; reference:bugtraq,3581; reference:bugtraq,3707; reference:cve,2001-0550; reference:cve,2001-0886; classtype:misc-attack; sid:1378; rev:15;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP RNFR ././ attempt"; flow:to_server,established; content:"RNFR "; nocase; content:" ././"; nocase; classtype:misc-attack; sid:1622; rev:5;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP command overflow attempt"; flow:to_server,established,no_stream; dsize:>100; reference:bugtraq,4638; reference:cve,2002-0606; classtype:protocol-command-decode; sid:1748; rev:8;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP LIST directory traversal attempt"; flow:to_server,established; content:"LIST"; nocase; content:".."; distance:1; content:".."; distance:1; reference:bugtraq,2618; reference:cve,2001-0680; reference:cve,2002-1054; reference:nessus,11112; classtype:protocol-command-decode; sid:1992; rev:8;)


# BAD FILES
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP .forward"; flow:to_server,established; content:".forward"; reference:arachnids,319; classtype:suspicious-filename-detect; sid:334; rev:5;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP .rhosts"; flow:to_server,established; content:".rhosts"; reference:arachnids,328; classtype:suspicious-filename-detect; sid:335; rev:5;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP authorized_keys"; flow:to_server,established; content:"authorized_keys"; classtype:suspicious-filename-detect; sid:1927; rev:2;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP passwd retrieval attempt"; flow:to_server,established; content:"RETR"; nocase; content:"passwd"; reference:arachnids,213; classtype:suspicious-filename-detect; sid:356; rev:5;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP shadow retrieval attempt"; flow:to_server,established; content:"RETR"; nocase; content:"shadow"; classtype:suspicious-filename-detect; sid:1928; rev:3;)

# suspicious login attempts
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP ADMw0rm ftp login attempt"; flow:to_server,established; content:"USER"; nocase; content:"w0rm"; distance:1; nocase; pcre:"/^USER\s+w0rm/smi"; reference:arachnids,01; classtype:suspicious-login; sid:144; rev:9;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP adm scan"; flow:to_server,established; content:"PASS ddd@|0A|"; reference:arachnids,332; classtype:suspicious-login; sid:353; rev:6;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP iss scan"; flow:to_server,established; content:"pass -iss@iss"; reference:arachnids,331; classtype:suspicious-login; sid:354; rev:5;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP pass wh00t"; flow:to_server,established; content:"pass wh00t"; nocase; reference:arachnids,324; classtype:suspicious-login; sid:355; rev:5;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP piss scan"; flow:to_server,established; content:"pass -cklaus"; classtype:suspicious-login; sid:357; rev:5;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP saint scan"; flow:to_server,established; content:"pass -saint"; reference:arachnids,330; classtype:suspicious-login; sid:358; rev:5;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP satan scan"; flow:to_server,established; content:"pass -satan"; reference:arachnids,329; classtype:suspicious-login; sid:359; rev:5;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP USER format string attempt"; flow:to_server,established; content:"USER"; nocase; pcre:"/^USER\s[^\n]*?%[^\n]*?%/smi"; reference:bugtraq,7474; reference:bugtraq,7776; reference:bugtraq,9262; reference:bugtraq,9402; reference:bugtraq,9600; reference:bugtraq,9800; reference:cve,2004-0277; reference:nessus,10041; reference:nessus,11687; classtype:misc-attack; sid:2178; rev:16;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP PASS format string attempt"; flow:to_server,established; content:"PASS"; nocase; pcre:"/^PASS\s[^\n]*?%[^\n]*?%/smi"; reference:bugtraq,7474; reference:bugtraq,9262; reference:bugtraq,9800; reference:cve,2000-0699; classtype:misc-attack; sid:2179; rev:6;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP MKDIR format string attempt"; flow:to_server,established; content:"MKDIR"; nocase; pcre:"/^MKDIR\s[^\n]*?%[^\n]*?%/smi"; reference:bugtraq,9262; classtype:misc-attack; sid:2332; rev:1;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP RENAME format string attempt"; flow:to_server,established; content:"RENAME"; nocase; pcre:"/^RENAME\s[^\n]*?%[^\n]*?%/smi"; reference:bugtraq,9262; classtype:misc-attack; sid:2333; rev:1;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP LIST buffer overflow attempt"; flow:to_server,established; content:"LIST"; nocase; pcre:"/^LIST\s[^\n]{100,}/smi"; reference:bugtraq,10181; reference:bugtraq,6869; reference:bugtraq,7251; reference:bugtraq,7861; reference:bugtraq,8486; reference:bugtraq,9675; reference:cve,1999-0349; reference:cve,1999-1510; reference:cve,2000-0129; reference:url,www.microsoft.com/technet/security/bulletin/MS99-003.mspx; classtype:misc-attack; sid:2338; rev:13;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP LIST integer overflow attempt"; flow:to_server,established; content:"LIST"; nocase; pcre:"/^LIST\s+\x22-W\s+\d+/smi"; reference:bugtraq,8875; reference:cve,2003-0853; reference:cve,2003-0854; classtype:misc-attack; sid:2272; rev:4;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 3535 (msg:"FTP Yak! FTP server default account login attempt"; flow:to_server,established; content:"USER"; nocase; content:"y049575046"; nocase; pcre:"/^USER\s+y049575046/smi"; reference:bugtraq,9072; classtype:suspicious-login; sid:2334; rev:2;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 3535 (msg:"FTP RMD / attempt"; flow:to_server,established; content:"RMD"; nocase; pcre:"/^RMD\s+\x2f$/smi"; reference:bugtraq,9159; classtype:attempted-dos; sid:2335; rev:2;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP invalid MDTM command attempt"; flow:to_server,established; content:"MDTM"; nocase; pcre:"/^MDTM \d+[-+]\D/smi"; reference:bugtraq,9751; reference:cve,2001-1021; reference:cve,2004-0330; classtype:attempted-admin; sid:2416; rev:5;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP format string attempt"; flow:to_server,established; content:"%"; pcre:"/\s+.*?%.*?%/smi"; classtype:string-detect; sid:2417; rev:1;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP RETR format string attempt"; flow:to_server,established; content:"RETR"; nocase; pcre:"/^RETR\s[^\n]*?%[^\n]*?%/smi"; reference:bugtraq,9800; classtype:attempted-admin; sid:2574; rev:1;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP RNFR overflow attempt"; flow:to_server,established; content:"RNFR"; nocase; isdataat:100,relative; pcre:"/^RNFR\s[^\n]{100}/smi"; classtype:attempted-admin; sid:3077; rev:1;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP REST with numeric argument"; flow:to_server,established; content:"REST"; nocase; pcre:"/REST\s+[0-9]+\n/i"; reference:bugtraq,7825; classtype:attempted-recon; sid:3460; rev:2;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP PORT bounce attempt"; flow:to_server,established; content:"PORT"; nocase; ftpbounce; pcre:"/^PORT/smi"; classtype:misc-attack; sid:3441; rev:1;)