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Secunia Security Advisory 17802

Secunia Security Advisory 17802
Posted Dec 1, 2005
Authored by Secunia | Site secunia.com

Secunia Security Advisory - Jack Louis has discovered a vulnerability in Perl, which can be exploited by malicious people to cause a Denial of Service.

tags | advisory, denial of service, perl
SHA-256 | c0e59c95fe0d6bbe1296f619b16fc9db831e6e46b81e3b82871f5ba07184009f

Secunia Security Advisory 17802

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TITLE:
Perl Explicit Format Parameter Index Integer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA17802

VERIFY ADVISORY:
http://secunia.com/advisories/17802/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Perl 5.x
http://secunia.com/product/2647/

DESCRIPTION:
Jack Louis has discovered a vulnerability in Perl, which can be
exploited by malicious people to cause a Denial of Service.

The vulnerability is caused due to an integer overflow error in the
"Perl_sv_vcatpvfn()" function of "sv.c" when handing a format string
that contains an explicit format parameter index that exceeds
INT_MAX. This can exploited to cause illegal memory access which
causes an affected Perl application to crash.

Example:
perl -e 'printf("%2147483649\$n");'

The vulnerability has been confirmed in version 5.8.7 and also
reported in versions 5.8.6 and 5.9.2. Other versions may also be
affected.

Note: This vulnerability must be exploited in conjunction with a
format string vulnerability in a Perl application. Exploiting this
vulnerability for arbitrary code execution has not been confirmed.

SOLUTION:
Ensure that Perl applications do not use unsanitised input as format
string.

PROVIDED AND/OR DISCOVERED BY:
Jack Louis, Dyad Security.

ORIGINAL ADVISORY:
http://www.dyadsecurity.com/perl-0002.html

----------------------------------------------------------------------

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.

----------------------------------------------------------------------

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