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Home » Hacking News » OpenPKG SA-2003.037: Sendmail DNS map vulnerability

OpenPKG SA-2003.037: Sendmail DNS map vulnerability

by Nikola Strahija on August 28th, 2003 Some versions of sendmail (8.12.0 through 8.12.8) contain a programming error in the code that implements DNS maps. A malformed DNS reply packet may cause sendmail to call `free()' on an uninitialized pointer.


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________________________________________________________________________

OpenPKG Security Advisory The OpenPKG Project
http://www.openpkg.org/security.html http://www.openpkg.org
[email protected] [email protected]
OpenPKG-SA-2003.037 28-Aug-2003
__________________________________________________________________

Package: sendmail
Vulnerability: Denial of Service
OpenPKG Specific: no

Affected Releases: Affected Packages: Corrected Packages:
OpenPKG CURRENT none N.A.
OpenPKG 1.3 none N.A.
OpenPKG 1.2 <= sendmail-8.12.7-1.2.2 >= sendmail-8.12.7-1.2.3

Dependent Packages: none

Description:
Oleg Bulyzhin reported to FreeBSD [1] a confirmed [2] Denial of
Service (DoS) vulnerability in all version of the Sendmail MTA [0]
earlier than 8.12.9. Due to a wrong initialization of an internal
structure, if Sendmail gets a bad DNS reply (with actual reply size
not equal the announced reply size), it later calls free() on a random
address. This usually cause Sendmail to crash.

Please check whether you are affected by running "/bin/rpm
-q sendmail". If you have the "sendmail" package installed and its
version is affected (see above), we recommend that you immediately
upgrade it (see Solution). [3][4]

Solution:
Select the updated source RPM appropriate for your OpenPKG release
[5], fetch it from the OpenPKG FTP service [6] or a mirror location,
verify its integrity [7], build a corresponding binary RPM from it [3]
and update your OpenPKG installation by applying the binary RPM [4].
For the affected release OpenPKG 1.2, perform the following operations
to permanently fix the security problem (for other releases adjust
accordingly).

$ ftp ftp.openpkg.org
ftp> bin
ftp> cd release/1.2/UPD
ftp> get sendmail-8.12.7-1.2.3.src.rpm
ftp> bye
$ /bin/rpm -v --checksig sendmail-8.12.7-1.2.3.src.rpm
$ /bin/rpm --rebuild sendmail-8.12.7-1.2.3.src.rpm
$ su -
# /bin/rpm -Fvh /RPM/PKG/sendmail-8.12.7-1.2.3.*.rpm
________________________________________________________________________

References:
[0] http://www.sendmail.org/
[1] http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/54367
[2] http://www.sendmail.org/dnsmap1.html
[3] http://www.openpkg.org/tutorial.html#regular-source
[4] http://www.openpkg.org/tutorial.html#regular-binary
[5] ftp://ftp.openpkg.org/release/1.2/UPD/sendmail-8.12.7-1.2.3.src.rpm
[6] ftp://ftp.openpkg.org/release/1.2/UPD/
[7] http://www.openpkg.org/security.html#signature
__________________________________________________________________

For security reasons, this advisory was digitally signed with the
OpenPGP public key "OpenPKG " (ID 63C4CB9F) of the
OpenPKG project which you can retrieve from http://pgp.openpkg.org and
hkp://pgp.openpkg.org. Follow the instructions on http://pgp.openpkg.org/
for details on how to verify the integrity of this advisory.
__________________________________________________________________

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