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Insecure Library Loading
Extremely critical

Sendmail Address Parsing Buffer Overflow

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Release Date:  2003-03-30    Views:  20,830

Secunia Advisory SA8446

Where:

From remote

Impact:

DoS, System access

Solution Status:

Vendor Patch

Operating System:

Software:

CVE Reference(s):

Description


A vulnerability has been discovered in Sendmail, which can be exploited by malicious people to compromise a vulnerable system.

The vulnerability is caused by a boundary error in "parseaddr.c" caused by a "char" to "int" conversion problem, which results in Sendmail not handling long email addresses containing the extended ASCII character "0xff" correct. A malicious person can exploit this to cause a buffer overflow by constructing an email with a specially crafted email address.

Successful exploitation can potentially allow execution of arbitrary code on the vulnerable system with the privileges of the sendmail process (typically "root").

Note: Internal vulnerable mail servers are also at risk, since a malicious email can be forwarded by an external, non-vulnerable mail server.

The following Sendmail versions have been confirmed vulnerable:
* Sendmail Pro (all versions)
* Sendmail Switch 2.1 prior to 2.1.6
* Sendmail Switch 2.2 prior to 2.2.6
* Sendmail Switch 3.0 prior to 3.0.4
* Sendmail for NT 2.X prior to 2.6.3
* Sendmail for NT 3.0 prior to 3.0.4
* Systems running open-source sendmail versions prior to 8.12.9, including UNIX and Linux systems.


Solution:
Some information regarding the vulnerability was disclosed on a public mailing list, before Sendmail.org had released an updated version. Sendmail.org has therefore rushed to issue an updated version, but the various OS vendors have not released any updated packages yet.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Michal Zalewski

Original Advisory:
http://www.sendmail.org/8.12.9.html

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: Sendmail Address Parsing Buffer Overflow

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