Bug 1980048 (CVE-2021-36377) - CVE-2021-36377 fossil: client-side TLS hostname verification bug
Summary: CVE-2021-36377 fossil: client-side TLS hostname verification bug
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-36377
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1980049
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-07-07 16:46 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-07-12 18:03 UTC (History)
4 users (show)

Fixed In Version:
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Last Closed: 2021-07-07 22:40:20 UTC
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Description Guilherme de Almeida Suckevicz 2021-07-07 16:46:08 UTC 
It has been discovered that the client-side TLS implementation in Fossil was often failing to verify that the hostname of the server matched the hostname contained in the TLS certificate. Hence, an "https" connection would always work as long as the server returned any valid certificate, even if that certificate did not match the hostname.

Reference:
https://fossil-scm.org/forum/forumpost/8d367e16f53d93c789d70bd3bf2c9587227bbd5c6a7b8e512cccd79007536036
Comment 1 Guilherme de Almeida Suckevicz 2021-07-07 16:46:23 UTC 
Created fossil tracking bugs for this issue:

Affects: fedora-all [bug 1980049]
Comment 2 Product Security DevOps Team 2021-07-07 22:40:20 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.
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