Exim header_check_syntax buffer overflow
| exim-headerschecksyntax-bo (16077) |  High Risk |
Description:
Exim is vulnerable to a stack-based buffer overflow, caused by improper bounds checking. If the headers_check_syntax setting is enabled in the exim.conf configuration file, which is not the default setting, a remote attacker could exploit this vulnerability to overflow a buffer and possibly execute arbitrary code on the vulnerable system.
Consequences:
Gain Access
Remedy:
For Debian GNU/Linux 3.0 (woody):
Upgrade to the latest version of exim (3.35-3woody2 or later), as listed in DSA-502-1. See References.
For Gentoo Linux:
Upgrade to the latest version of exim (4.33-r1 or later), as listed in GLSA 200405-07. See References.
For other distributions:
Contact your vendor for upgrade or patch information.
References:
- Full-Disclosure Mailing List, Thu May 06 2004 - 06:10:31 CDT: Buffer overflows in exim, yet still exim much better than windows.
- GLSA 200405-07: Exim verify=header_syntax buffer overflow. (From LinuxSecurity archive)
- BID-10291: Exim Header Syntax Checking Remote Stack Buffer Overrun Vulnerability
- CVE-2004-0400: Stack-based buffer overflow in Exim 4 before 4.33, when the headers_check_syntax option is enabled, allows remote attackers to cause a denial of service and possibly execute arbitrary code during the header check.
- DSA-501: exim -- buffer overflow
- DSA-502: exim-tls -- buffer overflow
- GLSA-200405-07: Exim verify=header_syntax buffer overflow
- SUSE-SA:2004:012: mc: local privilege escalation
Platforms Affected:
- Cambridge University Exim 3.35
- Debian Debian Linux 3.0
- Gentoo Linux
- Novell SuSE Linux Enterprise Server 7.0
- SUSE SuSE Linux 9.0
- SUSE SuSE Linux 9.1
- SuSE SuSE Linux Connectivity Server
- SuSE SuSE Linux Database Server
- SuSE SuSE Linux Office Server
Reported:
May 06, 2004
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