CVE-2018-20843 (NVD)

2019-06-24

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).

Products Ubuntu_linux, Debian_linux, Fedora, Libexpat, Leap, Hospitality_res_3700, Http_server, Outside_in_technology, Nessus
Type Improper Restriction of XML External Entity Reference ('XXE') (CWE-611)
First patch - None (likely due to unavailable code)
Patches • https://github.com/libexpat/libexpat/pull/262
• https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6
• https://github.com/libexpat/libexpat/issues/186
Links • https://www.debian.org/security/2019/dsa-4472
• https://usn.ubuntu.com/4040-1/
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226
• https://www.oracle.com/security-alerts/cpuapr2020.html
• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html