GLSA 200507-21: fetchmail: Buffer Overflow

http://security.gentoo.org/

Severity:	normal
Title:	fetchmail: Buffer Overflow
Date:	07/25/2005
Bugs:	#99865
ID:	200507-21

Synopsis

fetchmail is susceptible to a buffer overflow resulting in a Denial of Service or arbitrary code execution.

Background

fetchmail is a utility that retrieves and forwards mail from remote systems using IMAP, POP, and other protocols.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-mail/fetchmail	< 6.2.5.2	>= 6.2.5.2	All supported architectures

Description

fetchmail does not properly validate UIDs coming from a POP3 mail server. The UID is placed in a fixed length buffer on the stack, which can be overflown.

Impact

Very long UIDs returned from a malicious or compromised POP3 server can cause fetchmail to crash, resulting in a Denial of Service, or allow arbitrary code to be placed on the stack.

Workaround

There are no known workarounds at this time.

Resolution

All fetchmail users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-mail/fetchmail-6.2.5.2"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200507-21.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.