SpamAssassin spamc BSMTP -B off-by-one buffer overflow
| spamassassin-spamc-offbyone-bo (11154) |  High Risk |
Description:
SpamAssassin is vulnerable to buffer overflow, caused by an off-by-one that can occur when "dot" characters (.) are improperly filtered from SMTP lines. If a user is using the SpamAssassin spamc program in BSMTP mode and calls the program with the -B option, a remote attacker could send a specially-crafted email to the user to overflow a buffer and execute arbitrary code on the system with privileges of the spamc user.
Platforms Affected:
- Apache, SpamAssassin 2.40
- Apache, SpamAssassin 2.41
- Apache, SpamAssassin 2.42
- Apache, SpamAssassin 2.43
- Gentoo, Linux
Remedy:
As a workaround, apply the 3rd party patch for this vulnerability, as listed in the BugTraq Mailing List posting dated 2003-01-23 22:21:32. See References.
For Gentoo Linux:
Upgrade to the latest version of Mail-SpamAssasin (2.44 or later), as listed in Gentoo Linux Security Announcement 200302-01. See References.
Consequences:
Gain Access
References:
- BugTraq Mailing List, 2003-01-23 22:21:32, SpamAssassin / spamc+BSMTP remote buffer overflow at http://marc.theaimsgroup.com/?l=bugtraq&m=104342896818777&w=2.
- Gentoo Linux Security Announcement 200302-01, Mail-SpamAssasin -- arbitrary code execution at http://www.linuxsecurity.com/content/view/104574/104/.
- SpamAssassin Web site, SpamAssassin: Welcome to SpamAssassin at http://spamassassin.org/.
- BID-6679: SpamAssassin BSMTP Mode Buffer Overflow Vulnerability
- CVE-2003-1557: Off-by-one buffer overflow in spamc of SpamAssassin 2.40 through 2.43, when using BSMTP mode (-B), allows remote attackers to execute arbitrary code via email containing headers with leading . characters.
- SA7983: Gentoo updates to Mail-SpamAssasin
Reported:
Jan 23, 2003
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