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TITLE:
libarchive pax Extension Header Denial of Service and Buffer Overflow

SECUNIA ADVISORY ID:
SA26050

VERIFY ADVISORY:
http://secunia.com/advisories/26050/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
libarchive 1.x
http://secunia.com/product/12548/
libarchive 2.x
http://secunia.com/product/14779/

DESCRIPTION:
Some vulnerabilities have been reported in libarchive, which can be
exploited by malicious people to cause a DoS (Denial of Service) or
potentially compromise an application using the library.

The vulnerabilities are caused due to a NULL pointer dereference, an
infinite loop, and a buffer overflow when processing certain
malformed pax extension headers. These can be exploited to crash an
application, cause a high CPU load or potentially execute arbitrary
code by tricking a user or automated system to process a specially
crafted archive file with an application using the library.

The vulnerabilities are reported in versions prior to 2.2.4.

SOLUTION:
Update to version 2.2.4.
http://people.freebsd.org/~kientzle/libarchive/

PROVIDED AND/OR DISCOVERED BY:
The FreeBSD advisory credits CPNI, CERT-FI, Tim Kientzle, and Colin
Percival.

ORIGINAL ADVISORY:
http://security.freebsd.org/advisories/FreeBSD-SA-07:05.libarchive.asc

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