Improper input validation in PHP
CVE-2016-4538
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.062 (93.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 93.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.062 · newest: 0.062 · change: 0.000
Affected products
- PHP — versions 5.6.0, 5.6.1, 5.6.2
- Fedoraproject Fedora — versions 24
- openSUSE Leap — versions 42.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay
- lists.opensuse.org/opensuse-updates/2016-06/msg00027.html (vendor-advisory)
- security.gentoo.org/glsa/201611-22 (vendor-advisory)
- bugs.php.net/bug.php (Exploit)
- www.securityfocus.com/bid/90173 (vdb-entry)
- rhn.redhat.com/errata/RHSA-2016-2750.html (vendor-advisory)
- www.openwall.com/lists/oss-security/2016/05/05/21 (mailing-list)
- www.debian.org/security/2016/dsa-3602 (vendor-advisory)
- git.php.net/
- php.net/ChangeLog-5.php (Patch)
Frequently asked questions
- What is CVE-2016-4538?
- CVE-2016-4538 is a critical-severity vulnerability in PHP, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2016-05-22.
- How severe is CVE-2016-4538?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2016-4538 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.