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[ GLSA 200501-23 ] Exim: Two buffer overflows
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GLSA
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PostPosted: Thu Jan 13, 2005 12:41 am    Post subject: [ GLSA 200501-23 ] Exim: Two buffer overflows Reply with quote

Gentoo Linux Security Advisory

Title: Exim: Two buffer overflows (GLSA 200501-23)
Severity: high
Exploitable: remote
Date: January 12, 2005
Bug(s): #76893
ID: 200501-23

Synopsis

Buffer overflow vulnerabilities, which could lead to arbitrary code execution, have been found in the handling of IPv6 addresses as well as in the SPA authentication mechanism in Exim.

Background

Exim is an highly configurable message transfer agent (MTA) developed at the University of Cambridge.

Affected Packages

Package: mail-mta/exim
Vulnerable: < 4.43-r2
Unaffected: >= 4.43-r2
Architectures: All supported architectures


Description

Buffer overflows have been found in the host_aton() function (CAN-2005-0021) as well as in the spa_base64_to_bits() function (CAN-2005-0022), which is part of the SPA authentication code.

Impact

A local attacker could trigger the buffer overflow in host_aton() by supplying an illegal IPv6 address with more than 8 components, using a command line option. The second vulnerability could be remotely exploited during SPA authentication, if it is enabled on the server. Both buffer overflows can potentially lead to the execution of arbitrary code.

Workaround

There is no known workaround at this time.

Resolution

All Exim users should upgrade to the latest version:
Code:
# emerge --sync
# emerge --ask --oneshot --verbose ">=mail-mta/exim-4.43-r2"


References

Exim Announcement
CAN-2005-0021
CAN-2005-0022


Last edited by GLSA on Sun May 07, 2006 4:54 pm; edited 1 time in total
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