CVE-2020-35623
Due to improper username validation, it allowed user impersonation with trivial manipulations of certain characters within a given username.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.08%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
An issue was discovered in the CasAuth extension for MediaWiki through 1.35.1. Due to improper username validation, it allowed user impersonation with trivial manipulations of certain characters within a given username. An ordinary user may be able to login as a "bureaucrat user" who has a similar username, as demonstrated by usernames that differ only in (1) bidirectional override symbols or (2) blank space.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 1.08% probability · 63th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20, CWE-706
- Affected
- mediawiki/mediawiki
- Source
- cve@mitre.org
References
- https://github.com/CWRUChielLab/CASAuth/pull/11Patch, Third Party Advisory
- https://phabricator.wikimedia.org/T263498Exploit, Third Party Advisory
- https://github.com/CWRUChielLab/CASAuth/pull/11Patch, Third Party Advisory
- https://phabricator.wikimedia.org/T263498Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.