Use After Free in PHP
CVE-2016-5771
spl_array.c in the SPL extension in PHP before 5.5.37 and 5.6.x before 5.6.23 improperly interacts with the unserialize implementation and garbage collection, which allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free and application crash) via crafted serialized data.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.155 (96.7th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 96.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.155 · newest: 0.155 · change: 0.000
Affected products
- PHP
- Debian Linux — versions 8.0
- openSUSE Leap — versions 42.1
- openSUSE — versions 13.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/php/php-src/commit/3f627e580acfdaf0595ae3b115b8bec677f203ee (Patch, Third Party Advisory)
- lists.apple.com/archives/security-announce/2016/Sep/msg00006.html (vendor-advisory, Mailing List, Broken Link)
- lists.opensuse.org/opensuse-security-announce/2016-07/msg00004.html (vendor-advisory, Mailing List, Third Party Advisory)
- lists.opensuse.org/opensuse-updates/2016-08/msg00003.html (vendor-advisory, Mailing List, Third Party Advisory)
- rhn.redhat.com/errata/RHSA-2016-2750.html (vendor-advisory, Third Party Advisory)
- bugs.php.net/bug.php (Exploit, Issue Tracking, Vendor Advisory)
- php.net/ChangeLog-5.php (Patch, Release Notes, Vendor Advisory)
- www.openwall.com/lists/oss-security/2016/06/23/4 (mailing-list, Patch, Mailing List, Third Party Advisory)
- www.debian.org/security/2016/dsa-3618 (vendor-advisory, Third Party Advisory)
- www.securityfocus.com/bid/91401 (VDB Entry, Third Party Advisory, vdb-entry)
Frequently asked questions
- What is CVE-2016-5771?
- CVE-2016-5771 is a critical-severity vulnerability in PHP, classified under Use After Free. CVSS score: 9.8/10. Published 2016-08-07.
- How severe is CVE-2016-5771?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2016-5771 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.