[OpenPKG-SA-2004.012] OpenPKG Security Advisory (fetchmail)
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OpenPKG Security Advisory The OpenPKG Project
http://www.openpkg.org/security.html http://www.openpkg.org
openpkg-security@xxxxxxxxxxx openpkg@xxxxxxxxxxx
OpenPKG-SA-2004.012 08-Apr-2004
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Package: fetchmail
Vulnerability: denial of service
OpenPKG Specific: no
Affected Releases: Affected Packages: Corrected Packages:
OpenPKG CURRENT <= fetchmail-6.2.4-20031008 >= fetchmail-6.2.5-20031016
OpenPKG 1.3 <= fetchmail-6.2.3-1.3.0 >= fetchmail-6.2.3-1.3.1
OpenPKG 2.0 none N.A.
Dependent Packages: none
Description:
According to a Mandrake Linux security advisory [0], a denial of
service (DoS) vulnerability exists in the header rewriting code of
Fetchmail [1]. The code's intention is to hack message headers so
replies work properly. However, logic in the reply_hack() function
fails to allocate enough memory for long lines and may write past a
memory boundary. This could allow an attacker to cause a denial of
service by sending a specially crafted email and crashing fetchmail.
The Common Vulnerabilities and Exposures (CVE) project assigned the id
CAN-2003-0792 [2] to the problem.
Please check whether you are affected by running "<prefix>/bin/rpm
-q fetchmail". If you have the "fetchmail" 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 OpenPKG 1.3 release, perform the following operations to
permanently fix the security problem.
$ ftp ftp.openpkg.org
ftp> bin
ftp> cd release/1.3/UPD
ftp> get fetchmail-6.2.3-1.3.1.src.rpm
ftp> bye
$ <prefix>/bin/rpm -v --checksig fetchmail-6.2.3-1.3.1.src.rpm
$ <prefix>/bin/rpm --rebuild fetchmail-6.2.3-1.3.1.src.rpm
$ su -
# <prefix>/bin/rpm -Fvh <prefix>/RPM/PKG/fetchmail-6.2.3-1.3.1.*.rpm
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References:
[0]
http://www.mandrakesecure.net/en/advisories/advisory.php?name=MDKSA-2003:101
[1] http://www.catb.org/~esr/fetchmail/
[2] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0792
[3] http://www.openpkg.org/tutorial.html#regular-source
[4] http://www.openpkg.org/tutorial.html#regular-binary
[5] ftp://ftp.openpkg.org/release/1.3/UPD/fetchmail-6.2.3-1.3.1.src.rpm
[6] ftp://ftp.openpkg.org/release/1.3/UPD/
[7] http://www.openpkg.org/security.html#signature
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For security reasons, this advisory was digitally signed with the
OpenPGP public key "OpenPKG <openpkg@xxxxxxxxxxx>" (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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