Courier Mail Server libs/comverp.c usernames denial of service
| courier-usernames-dos (26998) |  Low Risk |
Description:
Courier Mail Server is vulnerable to a denial of service caused by an error in the libs/comverp.c file. Usernames containing the equals (=) character are not properly handled during encoding. A remote attacker could exploit this vulnerability to cause the consumption of all available CPU resources.
Consequences:
Denial of Service
Remedy:
Upgrade to the latest version of Courier Mail Server (0.53.2 or later), available from the Courier Mail Server Web site. See References.
For Debian GNU/Linux:
Refer to DSA-1101-1 for patch, upgrade, or suggested workaround information. See References.
For Gentoo Linux:
Refer to Gentoo Linux Security Announcement GLSA 200608-06 for patch, upgrade, or suggested workaround information. See References.
References:
- Courier Mail Server Web site: Courier Mail Server - latest releases.
- Debian Bug report logs - #368834: Spinning processes.
- BID-18345: Courier Mail Server Username Encoding Remote Denial Of Service Vulnerability
- CVE-2006-2659: libs/comverp.c in Courier MTA before 0.53.2 allows attackers to cause a denial of service (CPU consumption) via unknown vectors involving usernames that contain the = (equals) characters, which is not properly handled during encoding.
- DSA-1101: courier -- programming error
- GLSA-200608-06: Courier MTA: Denial of Service vulnerability
- SA20519: Courier Mail Server Username Encoding Denial of Service
- SECTRACK ID: 1016248: Courier Mailing List Manager Lets Remote Users Deny Service
- USN-294-1: courier vulnerability
- VUPEN/ADV-2006-2214: Courier Mail Server Username Handling Remote Denial of Service Vulnerability
Platforms Affected:
- Canonical Ubuntu 5.04
- Canonical Ubuntu 5.10
- Canonical Ubuntu 6.06 LTS
- Debian Debian Linux 3.0
- Debian Debian Linux 3.1
- Double Precision Courier 0.53.2
- Gentoo Linux
Reported:
May 25, 2006
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