Vulnerability CVE-2018-20843
Published: 2019-06-24

Description:
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).

Type:

CWE-611

 (Information Exposure Through XML External Entity Reference)

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.8/10
6.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Complete
Affected software
Libexpat -> Expat 

 References:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226
https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes
https://github.com/libexpat/libexpat/issues/186
https://github.com/libexpat/libexpat/pull/262
https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6
https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html
https://seclists.org/bugtraq/2019/Jun/39
https://security.netapp.com/advisory/ntap-20190703-0001/
https://usn.ubuntu.com/4040-1/
https://usn.ubuntu.com/4040-2/
https://www.debian.org/security/2019/dsa-4472
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