Snort team,
When a debian user is updating zsh via the aptitude package manager, a
false positive will be generated on rule:
Gen:SID 1:1309
Message WEB-CGI zsh access
The reason is that the string '/zsh' naturally occurs in the request. a
typical payload of this particular false positive is:
length = 143
000 : 47 45 54 20 2F 64 65 62 69 61 6E 2F 70 6F 6F 6C GET /debian/pool
010 : 2F 6D 61 69 6E 2F 7A 2F 7A 73 68 2F 7A 73 68 5F /main/z/zsh/zsh_
020 : 34 2E 32 2E 31 2D 35 5F 69 33 38 36 2E 64 65 62 4.2.1-5_i386.deb
030 : 20 48 54 54 50 2F 31 2E 31 0D 0A 48 6F 73 74 3A HTTP/1.1..Host:
040 : 20 66 74 70 2E 75 73 2E 64 65 62 69 61 6E 2E 6F ftp.us.debian.o
050 : 72 67 0D 0A 43 6F 6E 6E 65 63 74 69 6F 6E 3A 20 rg..Connection:
060 : 6B 65 65 70 2D 61 6C 69 76 65 0D 0A 55 73 65 72 keep-alive..User
070 : 2D 41 67 65 6E 74 3A 20 44 65 62 69 61 6E 20 41 -Agent: Debian A
080 : 50 54 2D 48 54 54 50 2F 31 2E 33 0D 0A 0D 0A PT-HTTP/1.3....
I'm afraid I'm not familiar enough with snort nor a zsh exploit to submit
a fixed rule myself... since the rule simply looks for the string '/zsh'
I'm not quite sure what the best way to prevent that is...
Cheers!
Stu
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