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TITLE:
PECL phar Extension Format String Vulnerabilities

SECUNIA ADVISORY ID:
SA42726

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/42726/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=42726

RELEASE DATE:
2010-12-27

DISCUSS ADVISORY:
http://secunia.com/advisories/42726/#comments

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http://secunia.com/advisories/42726/

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https://ca.secunia.com/?page=viewadvisory&vuln_id=42726

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DESCRIPTION:
Some vulnerabilities have been reported in the PECL phar extension,
which can be exploited by malicious people to cause a DoS (Denial of
Service) and potentially compromise a vulnerable system.

The "php_stream_wrapper_log_error()" function is improperly called
with controlled format string arguments while parsing PHP archives
(phar). This can be exploited to disclose or potentially corrupt
memory when e.g. an invalid filename containing format string
specifiers is requested from a phar file.

This is related to vulnerability #2 in:
SA39573

SOLUTION:
Fixed in the SVN repository.

Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

PROVIDED AND/OR DISCOVERED BY:
Originally reported in PHP by Stefan Esser. Reported in the PECL phar
extension by Eygene Ryabinkin.

ORIGINAL ADVISORY:
Eygene Ryabinkin:
http://www.openwall.com/lists/oss-security/2010/12/26/1

PECL phar SVN commit:
http://svn.php.net/viewvc?view=revision&revision=306667

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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