12946 : Exim -bh Command Line Option dns_build_reverse Function Local Overflow
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
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Timeline

Disclosure Date
2005-01-14

Description

A local overflow exists in Exim. Exim fails to check the length of a string resulting in a buffer overflow in the dns_build_reverse() function. Exim drops SUID privileges before the vulnerable code is reached. With a specially crafted request, an attacker can further escalate privileges or retrieve the mailer uid to access email messages, resulting in a loss of integrity and confidentiality.

Classification

Location: Local Access Required
Attack Type: Input Manipulation
Impact: Loss of Confidentiality, Loss of Integrity
Exploit: Exploit Public

Solution

Upgrade to version 4.44 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products

Exim

4.43

References

Milw0rm: 1009 756
Exploit Database: 1009 756
Security Tracker: 1012904
CVE ID: 2005-0021 (see also: NVD)
Mail List Post: http://archives.neohapsis.com/archives/bugtraq/2005-01/0170.html
http://archives.neohapsis.com/archives/bugtraq/2005-01/0178.html
http://archives.neohapsis.com/archives/bugtraq/2005-05/0282.html
Vendor URL: http://www.exim.org/
Other Advisory URL: http://www.idefense.com/application/poi/display?id=183&type=vulnerabilities
Generic Exploit URL: http://www.securiteam.com/exploits/5WP0R1PFPM.html

Tools & Filters

	16111 16113 16132 16155 16414 17165 19118 20674

Credit

Anonymous - iDefense Labs VCP

CVSSv2 Score

CVSSv2 Base Score = 7.2
Source: nvd.nist.gov | Generated: 2005-05-13 | Disagree?

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