CVE-2018-20843
HIGH severity · CVSS 7.5 · XML external entity (XXE)
7.5CVSS HIGH
Summary
In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactNone
Integrity impactNone
Availability impactHigh
Exploit probability (EPSS)7%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://github.com/libexpat/libexpat/issues/186 ↗
Additional information
- NVD record
- https://github.com/libexpat/libexpat/issues/186Patch
- https://github.com/libexpat/libexpat/pull/262Patch
- https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6Patch
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.htmlAdvisory
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226Advisory
- https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/ChangesAdvisory
- https://lists.debian.org/debian-lts-announce/2019/06/msg00028.htmlAdvisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/