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Secunia Security Advisory 39573

Secunia Security Advisory 39573
Posted May 4, 2010
Authored by Secunia | Site secunia.com

Secunia Security Advisory - Stefan Esser has discovered a vulnerability in PHP, which can be exploited by malicious people to cause a DoS (Denial of Service).

tags | advisory, denial of service, php
MD5 | be1b7faaa14a58c0a1f9f6bd27dd7acd

Secunia Security Advisory 39573

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TITLE:
PHP HTTP Chunked Encoding Processing Signedness Vulnerability

SECUNIA ADVISORY ID:
SA39573

VERIFY ADVISORY:
http://secunia.com/advisories/39573/

DESCRIPTION:
Stefan Esser has discovered a vulnerability in PHP, which can be
exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to a signedness error within the
"php_dechunk()" function in ext/standard/filters.c when processing
HTTP streams. This can be exploited to corrupt memory and cause a
crash when an HTTP chunk having an overly large size is processed
through the "dechunk" filter.

The vulnerability is confirmed in version 5.3.2. Other versions may
also be affected.

SOLUTION:
Do not process untrusted HTTP streams in PHP applications.

PROVIDED AND/OR DISCOVERED BY:
Stefan Esser

ORIGINAL ADVISORY:
http://php-security.org/2010/05/02/mops-2010-003-php-dechunk-filter-signed-comparison-vulnerability/index.html

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

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

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