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)
EPSS: 0.062 (92.8th percentile) — read the EPSS interpretation.
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.
Affected products
- Php — versions 5.6.0, 5.6.1, 5.6.2
- Fedoraproject Fedora — versions 24
- Opensuse Leap — versions 42.1
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@debian.org (x_refsource_CONFIRM)
- security@debian.org (vendor-advisory, x_refsource_SUSE)
- security@debian.org (vendor-advisory, x_refsource_GENTOO)
- security@debian.org (x_refsource_CONFIRM, Exploit)
- security@debian.org (vdb-entry, x_refsource_BID)
- security@debian.org (x_refsource_REDHAT, vendor-advisory)
- security@debian.org (mailing-list, x_refsource_MLIST)
- security@debian.org (vendor-advisory, x_refsource_DEBIAN)
- security@debian.org (x_refsource_CONFIRM)
- security@debian.org (x_refsource_CONFIRM, 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.