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Home » Hacking News » [CLA-2003:567] Conectiva Linux Security Announcement - mcrypt

[CLA-2003:567] Conectiva Linux Security Announcement - mcrypt

by Nikola Strahija on February 5th, 2003 Ilia Alshanetsky found[1] several buffer overflows vulnerabilities[2] in libmcrypt.

PACKAGE : mcrypt
SUMMARY : Buffer overflow and memory leak vulnerabilities
DATE : 2003-02-05 15:36:00
ID : CLA-2003:567
RELEASES : 7.0, 8

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The mcrypt package contains libmcrypt, a decryption and encryption
library with support for various algorithms.

Ilia Alshanetsky found[1] several buffer overflows vulnerabilities[2]
in libmcrypt. These vulnerabilities basically consist of improper or
lack of validation for some input (which in some scenarios can came
from a local user or from a network connection).

Another vulnerability[3] exists in the way libmcrypt loads algorithms
via libtool. When different algorithms are loaded dynamically a small
part of memory is leaked. In a persistant environment, an attacker
can exhaust all available memory by launching repeated requests to an
application that utilizes the mcrypt library.

These vulnerabilites are fixed in libmcrypt version 2.5.5, and the
changes were backported to mcrypt-2.4.9 in Conectiva Linux 7.0 and
mcrypt-2.4.18 in Conectiva Linux 8. Conectiva Linux 6.0 does not ship
the mcrypt package.

All users of the package mcrypt should upgrade.

Please note that in order to complete the upgrade process, you must
restart all running aplications that are linked against libmcrypt
after the new packages installation. You can see a list of such
applications using the lsof utility, as seen below:

# lsof | grep libmcrypt



Users of Conectiva Linux version 6.0 or higher may use apt to perform
upgrades of RPM packages:

- run: apt-get update
- after that, execute: apt-get upgrade

Detailed instructions reagarding the use of apt and upgrade examples
can be found at

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All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at
Instructions on how to check the signatures of the RPM packages can be
found at
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All our advisories and generic update instructions can be viewed at

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