Gentoo: libmcrypt buffer overflow vulnerabilities
limbcrypt versions prior to 2.5.5 contain a number of buffer overflow vulnerabilities that stem from imporper or lacking input validation.
Summary
- -------------------------------------------------------------------- GENTOO LINUX SECURITY ANNOUNCEMENT 200301-4 - -------------------------------------------------------------------- DATE : 2003-01-05 12:01 UTC
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Post by Ilia Alshanetsky <ilia@prohost.org>:
"limbcrypt versions prior to 2.5.5 contain a number of buffer overflow vulnerabilities that stem from imporper or lacking input validation. By passing a longer then expected input to a number of functions (multiple functions are affected) the user can successful make libmcrypt crash.
Another vulnerability is due to the way libmcrypt loads algorithms via libtool. When the algorithms are loaded dynamically the each time the algorithm is loaded a small (few kilobytes) of memory are leaked. In a persistant enviroment (web server) this could lead to a memory exhaustion attack that will exhaust all avaliable memory by launching repeated requests at an application utilizing the mcrypt library.
The solution to both of these problem is to upgrade to the latest release of libmcrypt, 2.5.5."
SOLUTION
It is recommended that all Gentoo Linux users who are running dev-libs/libmcrypt-2.5.1-r4 or earlier update their systems as follows:
emerge rsync emerge libmcrypt emerge clean
- -------------------------------------------------------------------- aliz@gentoo.org - GnuPG key is available at - --------------------------------------------------------------------
Resolution
References
Availability
Concerns
Severity
PACKAGE : libmcrypt
SUMMARY : buffer overflows and memory exhaustion
EXPLOIT : remote
