[ GLSA 200507-21 ] fetchmail: Buffer Overflow

2005-07-2500:00:00

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Gentoo Linux Security Advisory GLSA 200507-21

                                        http://security.gentoo.org/

Severity: Normal
Title: fetchmail: Buffer Overflow
Date: July 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
-------------------------------------------------------------------

1 net-mail/fetchmail < 6.2.5.2 >= 6.2.5.2

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 &quot;&gt;=net-mail/fetchmail-6.2.5.2&quot;

References

[ 1 ] Fetchmail Security Advisory
http://fetchmail.berlios.de/fetchmail-SA-2005-01.txt
[ 2 ] CAN-2005-2335
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2335

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
[email protected] or alternatively, you may file a bug at
http://bugs.gentoo.org.