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CVE-2016-6296

9.8 · CRITICAL

Integer signedness error in the simplestring_addn function in simplestring.c in xmlrpc-epi through 0.54.2, as used in PHP before 5.5.38, 5.6.x before 5.6.24, and 7.x before 7.0.9, allows remote att…

Published Jul 25, 2016CWE-119EPSS 6.27%

Overview

CVE-2016-6296 is a critical-severity vulnerability. It was published on July 25, 2016 and has a CVSS 3.0 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.0 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Integer signedness error in the simplestring_addn function in simplestring.c in xmlrpc-epi through 0.54.2, as used in PHP before 5.5.38, 5.6.x before 5.6.24, and 7.x before 7.0.9, allows remote attackers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other impact via a long first argument to the PHP xmlrpc_encode_request function.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

References

Refgit.php.net/?p=php-src.git%3Ba=commit%3Bh=e6c48213c22ed50b2b987b479fcc1ac709394caaReflists.apple.com/archives/security-announce/2016/Sep/msg00006.htmlRefopenwall.com/lists/oss-security/2016/07/24/2Refphp.net/ChangeLog-5.phpRefphp.net/ChangeLog-7.phpRefrhn.redhat.com/errata/RHSA-2016-2750.htmlRefwww.debian.org/security/2016/dsa-3631Refwww.securityfocus.com/bid/92095Refwww.securitytracker.com/id/1036430Refwww.ubuntu.com/usn/USN-3059-1

How CyberStrike helps

Frequently asked questions

What is CVE-2016-6296?

CVE-2016-6296 is a critical-severity vulnerability. It was published on July 25, 2016 and has a CVSS 3.0 base score of 9.8 (CRITICAL).

How severe is CVE-2016-6296?

This vulnerability has a CVSS 3.0 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2016-6296?

Check the references section for vendor advisories, patches, and mitigation guidance. 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-2016-6296?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-6296 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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