CVE-2016-1839
Description
The xmlDictAddString function in libxml2 before 2.9.4, as used in Apple iOS before 9.3.2, OS X before 10.11.5, tvOS before 9.2.1, and watchOS before 2.2.1, allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted XML document.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
libxml2 - xmlDictAddString Heap Buffer Overread
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 2.9.3+dfsg1-1.1 |
| debian | bullseye | fixed | 2.9.3+dfsg1-1.1 |
| debian | forky | fixed | 2.9.3+dfsg1-1.1 |
| debian | sid | fixed | 2.9.3+dfsg1-1.1 |
| debian | trixie | fixed | 2.9.3+dfsg1-1.1 |
| rhel | 6.0 | affected | |
| rhel | 7.0 | affected | |
| ubuntu | 12.04 | affected | |
| ubuntu | 14.04 | affected | |
| ubuntu | 15.10 | affected | |
| ubuntu | 16.04 | affected | |
| debian | 8.0 | affected | |
| macos | affected | 9.3.2 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| mcafee | web_gateway | {"startIncluding":"7.5.0.0","endIncluding":"7.5.2.10"} | |
| xmlsoft | libxml2 | {"endExcluding":"2.9.4"} | 2.9.4 |
References
- https://www.suse.com/security/cve/CVE-2016-1839.html
- http://lists.apple.com/archives/security-announce/2016/May/msg00001.html
- http://lists.apple.com/archives/security-announce/2016/May/msg00002.html
- http://lists.apple.com/archives/security-announce/2016/May/msg00003.html
- http://lists.apple.com/archives/security-announce/2016/May/msg00004.html
- http://rhn.redhat.com/errata/RHSA-2016-2957.html
- http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- http://www.securityfocus.com/bid/90691
- http://www.securitytracker.com/id/1035890
- http://www.securitytracker.com/id/1038623
- http://www.ubuntu.com/usn/USN-2994-1
- http://xmlsoft.org/news.html
- https://access.redhat.com/errata/RHSA-2016:1292
- https://bugzilla.gnome.org/show_bug.cgi?id=758605
- https://git.gnome.org/browse/libxml2/commit/?id=a820dbeac29d330bae4be05d9ecd939ad6b4aa33
- https://kc.mcafee.com/corporate/index?page=content&id=SB10170
- https://security.gentoo.org/glsa/201701-37
- https://support.apple.com/HT206564
- https://support.apple.com/HT206566
- https://support.apple.com/HT206567
- https://support.apple.com/HT206568
- https://www.debian.org/security/2016/dsa-3593
- https://www.tenable.com/security/tns-2016-18
CWEs
CWE-125
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.