Vulnerability Note VU#518518
metamail contains multiple format string vulnerabilities
Multiple format string vulnerabilities in the metamail package could allow a remote attacker to execute arbitrary code on the vulnerable system. An attacker may be able to exploit these vulnerabilities via a specially-crafted email message.
The metamail package is one of the first widely adopted packages developed to handle Multipurpose Internet Mail Extensions (MIME) data, and includes a number of programs for handling various MIME types. Although it is mostly historic, it is still in wide deployment in many environments. Two format string vulnerabilities have been discovered in various portions of the metamail codebase. According to an analysis published by Ulf Härnhammar:
The first format string bug occurs when a message has a "multipart/alternative" media type and one of the body parts has a "Content-Type" header with parameter names or values containing formatting codes. It occurs because of two bad fprintf() statements in the function SaveSquirrelFile() - yes, it's really called that - in metamail.c. [...]
Although programs included in the metamail package can be invoked explicitly by a user from the command line, they are commonly invoked automatically by a mail reader or intermediate mail handling applications. Examples of such applications include, but are not limited to, virus scanners, spam filtering software, and mail delivery agents such as procmail. This is an important consideration since messages containing malicious code may be automatically or inadvertently passed to metamail in these cases.
NOTE: Proof-of-concept exploit code has been published for this vulnerability.
An attacker may be able to execute code of their choosing on a vulnerable system by introducing a specially-crafted MIME attachment. The code would be executed in the context of the user who invoked the metamail program or mail handling program that launched metamail.
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Systems Affected (Learn More)
|Vendor||Status||Date Notified||Date Updated|
|Debian||Affected||-||24 Feb 2004|
|MandrakeSoft||Affected||-||20 Feb 2004|
|Red Hat Inc.||Affected||-||04 Mar 2004|
|SGI||Affected||-||04 Mar 2004|
|Slackware||Affected||-||20 Feb 2004|
CVSS Metrics (Learn More)
Thanks to Ulf Härnhammar for reporting this vulnerability.
This document was written by Chad R Dougherty.
- CVE IDs: CAN-2004-0104
- Date Public: 18 Feb 2004
- Date First Published: 24 Feb 2004
- Date Last Updated: 04 Mar 2004
- Severity Metric: 14.25
- Document Revision: 10
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