Vulnerability Description
The bcpowmod function in ext/bcmath/bcmath.c in PHP before 5.5.35, 5.6.x before 5.6.21, and 7.x before 7.0.6 modifies certain data structures without considering whether they are copies of the _zero_, _one_, or _two_ global variable, which allows remote attackers to cause a denial of service or possibly have unspecified other impact via a crafted call.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Php | Php | <= 5.5.33 |
| Fedoraproject | Fedora | 24 |
| Opensuse | Leap | 42.1 |
Related Weaknesses (CWE)
References
- http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183736.html
- http://lists.opensuse.org/opensuse-updates/2016-05/msg00086.html
- http://lists.opensuse.org/opensuse-updates/2016-06/msg00027.html
- http://php.net/ChangeLog-5.phpPatch
- http://php.net/ChangeLog-7.phpPatch
- http://rhn.redhat.com/errata/RHSA-2016-2750.html
- http://www.debian.org/security/2016/dsa-3602
- http://www.openwall.com/lists/oss-security/2016/05/05/21
- http://www.securityfocus.com/bid/90173
- https://bugs.php.net/bug.php?id=72093Exploit
- https://git.php.net/?p=php-src.git%3Ba=commit%3Bh=d650063a0457aec56364e4005a636d
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c
- https://security.gentoo.org/glsa/201611-22
FAQ
What is CVE-2016-4538?
CVE-2016-4538 is a vulnerability with a CVSS score of 9.8 (CRITICAL). The bcpowmod function in ext/bcmath/bcmath.c in PHP before 5.5.35, 5.6.x before 5.6.21, and 7.x before 7.0.6 modifies certain data structures without considering whether they are copies of the _zero_,...
How severe is CVE-2016-4538?
CVE-2016-4538 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2016-4538?
Check the references section above for vendor advisories and patch information. Affected products include: Php Php, Fedoraproject Fedora, Opensuse Leap.