TITLE:
Exim IPv6 Handling and SPA Authentication Vulnerabilities

SECUNIA ADVISORY ID:
SA13713

VERIFY ADVISORY:
http://secunia.com/advisories/13713/

CRITICAL:
Moderately critical

IMPACT:
Privilege escalation, System access

WHERE:
>From remote

SOFTWARE:
Exim 4.x
http://secunia.com/product/841/

DESCRIPTION:
Two vulnerabilities have been reported in Exim, which potentially can
be exploited by malicious, local users to gain escalated privileges
and by malicious people to compromise a vulnerable system.

1) A boundary error in the function "host_aton()" when handling IPv6
addresses may be exploited to cause a buffer overflow by supplying a
specially crafted IPv6 address with more than 8 components to an
unspecified command line option.

2) A boundary error in the function "spa_base64_to_bits()" when
handling SPA authentication can be exploited to cause a buffer
overflow.

Successful exploitation requires that SPA authentication is enabled.

The vulnerabilities have been reported in version 4.43 and prior.

SOLUTION:
Patches are available and fixes have been included in the current
source and the CVS repository.

PROVIDED AND/OR DISCOVERED BY:
Reported by vendor.

ORIGINAL ADVISORY:
http://www.exim.org/mail-archives/exim-announce/2005/msg00000.html

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