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CVE-2008-5557

10.0 · HIGH

Heap-based buffer overflow in ext/mbstring/libmbfl/filters/mbfilter_htmlent.c in the mbstring extension in PHP 4.3.0 through 5.2.6 allows context-dependent attackers to execute arbitrary code via a…

Published Dec 23, 2008phpCWE-119EPSS 7.37%

Overview

CVE-2008-5557 is a high-severity vulnerability affecting php php. It was published on December 23, 2008 and has a CVSS 2.0 base score of 10.0 (HIGH).

This vulnerability has a CVSS 2.0 base score of 10.0, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Heap-based buffer overflow in ext/mbstring/libmbfl/filters/mbfilter_htmlent.c in the mbstring extension in PHP 4.3.0 through 5.2.6 allows context-dependent attackers to execute arbitrary code via a crafted string containing an HTML entity, which is not properly handled during Unicode conversion, related to the (1) mb_convert_encoding, (2) mb_check_encoding, (3) mb_convert_variables, and (4) mb_parse_str functions.

Remediation

Check the references section for vendor advisories and patches from php. Update php to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refarchives.neohapsis.com/archives/fulldisclosure/2008-12/0477.htmlRefbugs.php.net/bug.php?id=45722Refcvs.php.net/viewvc.cgi/php-src/ext/mbstring/libmbfl/filters/mbfilter_htmlent.c?r1=1.7&r2=1.8Refh20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02029444Reflists.apple.com/archives/security-announce/2009/May/msg00002.htmlReflists.opensuse.org/opensuse-security-announce/2009-02/msg00002.htmlReflists.opensuse.org/opensuse-security-announce/2009-04/msg00003.htmlRefmarc.info/?l=bugtraq&m=124654546101607&w=2Refmarc.info/?l=bugtraq&m=125631037611762&w=2Refsecunia.com/advisories/34642

How CyberStrike helps

Frequently asked questions

What is CVE-2008-5557?

CVE-2008-5557 is a high-severity vulnerability affecting php php. It was published on December 23, 2008 and has a CVSS 2.0 base score of 10.0 (HIGH).

How severe is CVE-2008-5557?

This vulnerability has a CVSS 2.0 base score of 10.0, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2008-5557?

Check the references section for vendor advisories and patches from php. Update php to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2008-5557?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2008-5557 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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