Fetchmail NULL pointer dereference denial of service
| fetchmail-null-pointer-dos (23713) |  Low Risk |
Description:
Fetchmail is vulnerable to a denial of service attack, caused by a NULL pointer dereference when Fetchmail is configured for multidrop mode. A remote attacker, using a malicious mail server, could send a specially-crafted message without headers to cause affected Fetchmail clients to crash.
Platforms Affected:
- Canonical, Ubuntu 4.10
- Canonical, Ubuntu 5.04
- Canonical, Ubuntu 5.10
- Debian, Debian Linux 3.1
- Eric S. Raymond, Fetchmail 6.2.5.4 and prior
- Eric S. Raymond, Fetchmail 6.3.1 and prior
- MandrakeSoft, Mandrake Linux 10.1 X86_64
- MandrakeSoft, Mandrake Linux 10.1
- MandrakeSoft, Mandrake Linux 2006 X86_64
- MandrakeSoft, Mandrake Linux 2006
- MandrakeSoft, Mandrake Linux LE2005
- MandrakeSoft, Mandrake Linux LE2005 X86_64
- MandrakeSoft, Mandrake Linux Corporate Server 3.0 X86_64
- MandrakeSoft, Mandrake Linux Corporate Server 3.0
- RedHat, Enterprise Linux 2.1 AS
- RedHat, Enterprise Linux 2.1 WS
- RedHat, Enterprise Linux 2.1 ES
- RedHat, Enterprise Linux 3 Desktop
- RedHat, Enterprise Linux 3 ES
- RedHat, Enterprise Linux 3 AS
- RedHat, Enterprise Linux 3 WS
- RedHat, Enterprise Linux 4 WS
- RedHat, Enterprise Linux 4 AS
- RedHat, Enterprise Linux 4 Desktop
- RedHat, Enterprise Linux 4 ES
- RedHat, Linux Advanced Workstation 2.1 Itanium
- Turbolinux, Turbolinux 10 Desktop
- Turbolinux, Turbolinux 10 F...
- Turbolinux, Turbolinux 10 Server
- Turbolinux, Turbolinux 10 Server x64 Ed
- Turbolinux, Turbolinux 8 Server
- Turbolinux, Turbolinux FUJI
- Turbolinux, Turbolinux Home
- Turbolinux, Turbolinux Multimedia
- Turbolinux, Turbolinux Personal
- Turbolinux, Turbolinux Appliance Server 1.0 Hosting Ed
- Turbolinux, Turbolinux Appliance Server 1.0 Workgroup Ed
- Turbolinux, Turbolinux Appliance Server 2.0
Remedy:
Upgrade to the latest version of Fetchmail (6.3.1 or later) or (6.2.5.5 or later), available from the Fetchmail Web site. See References.
For Debian GNU/Linux:
Refer to DSA-939-1 for patch, upgrade, or suggested workaround information. See References.
For Apple Mac OS X:
Apply Apple Security Update 2006-004, available from the Apple Web site. See References.
For Ubuntu Linux:
Refer to USN-233-1 for patch, upgrade, or suggested workaround information. See References.
For Red Hat Linux:
Refer to RHSA-2007:0018-10 for patch, upgrade, or suggested workaround information. See References.
For other distributions:
Contact your vendor for patch or upgrade information.
Consequences:
Denial of Service
References:
- Apple Security Update 2006-004, About Security Update 2006-004 at http://docs.info.apple.com/article.html?artnum=304063.
- Fetchmail Security Annoucement fetchmail-SA-2005-03, fetchmail-SA-2005-03: security announcement at http://fetchmail.berlios.de/fetchmail-SA-2005-03.txt.
- ASA-2007-111: fetchmail security update (RHSA-2007-0018)
- BID-15987: Fetchmail Missing Email Header Remote Denial of Service Vulnerability
- BID-19289: Apple Mac OS X Multiple Security Vulnerabilities
- CVE-2005-4348: fetchmail before 6.3.1 and before 6.2.5.5, when configured for multidrop mode, allows remote attackers to cause a denial of service (application crash) by sending messages without headers from upstream mail servers.
- DSA-939: fetchmail -- programming error
- MDKSA-2005:236: Updated fetchmail packages fix vulnerability
- OSVDB ID: 21906: Fetchmail Multidrop Mode Headerless Message Remote DoS
- RHSA-2007-0018: Moderate: fetchmail security update
- SA17891: Fetchmail Headerless Message Denial of Service Vulnerability
- SA21253: Mac OS X Security Update Fixes Multiple Vulnerabilities
- SECTRACK ID: 1015383: Fetchmail Can Be Crashed By Remote Users By Sending a Headerless Message
- SUSE-SR:2007:004: SUSE Security Summary Report
Reported:
Dec 19, 2005
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