[SA19295] LibVC "count_vcards()" Buffer Overflow Vulnerability

TITLE:
LibVC "count_vcards()" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA19295

VERIFY ADVISORY:
http://secunia.com/advisories/19295/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
LibVC
http://secunia.com/product/8950/

DESCRIPTION:
trew has discovered a vulnerability in LibVC, which potentially can
be exploited by malicious people to compromise a user's system.

The vulnerability is caused due to a boundary error in the
"count_vcards()" function in vc.c when reading lines from an input
vcard (.vcf) file. This can be exploited to cause a stack-based
buffer overflow via overly long lines in a vcard file and may allow
arbitrary code execution.

Successful exploitation requires that the library is used to parse a
malicious vcard (.vcf) file.

The vulnerability has been confirmed in version 003. Other versions
may also be affected.

Note: The library may be used by other applications as a shared
library e.g. Rolo.

SOLUTION:
Do not use to library to parse vcard files from untrusted sources.

PROVIDED AND/OR DISCOVERED BY:
trew

ORIGINAL ADVISORY:
http://osvdb.org/ref/23/23985-libvc.txt

---

About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/

Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.