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Insecure Library Loading
Moderately critical

Exim Three Vulnerabilities

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Release Date:  2005-01-06    Last Update:  2005-01-28    Views:  14,496

Secunia Advisory SA13713

Where:

From remote

Impact:

Privilege escalation, System access

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


Three 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.

3) A boundary error in the "dns_build_reverse()" function can be exploited to cause a buffer overflow by passing an overly long string via a command line option.

Successful exploitation may allow execution of arbitrary code with escalated privileges.

The vulnerabilities have been reported in version 4.43 and prior.


Solution:
Update to version 4.44.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Discovered by anonymous person and reported via iDEFENSE.

Original Advisory:
Exim.org:
http://www.exim.org/mail-archives/exim-announce/2005/msg00000.html

iDEFENSE:
http://www.idefense.com/application/poi/display?id=178&type=vulnerabilities
http://www.idefense.com/application/poi/display?id=179&type=vulnerabilities
http://www.idefense.com/application/poi/display?id=183&type=vulnerabilities

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Exim Three Vulnerabilities

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