Bug 2255207 (CVE-2023-4255)

Summary: CVE-2023-4255 w3m: out-of-bounds write in function checkType() in etc.c (incomplete fix for CVE-2022-38223)
Product: [Other] Security Response Reporter: TEJ RATHI <trathi>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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OS: Linux   
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An out-of-bounds write issue has been discovered in the backspace handling of the checkType() function in etc.c within the W3M application. This vulnerability is triggered by supplying a specially crafted HTML file to the w3m binary. Exploitation of this flaw could lead to application crashes, resulting in a denial of service condition.
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Bug Depends On: 2255208, 2255209    
Bug Blocks: 2224664    

Description TEJ RATHI 2023-12-19 10:31:11 UTC 
w3m has an out-of-bounds write in function checkType() in etc.c. It allows a local attacker to cause Denial of Service or possibly have unspecified other impact via a crafted HTML file. NOTE: It was introduced in the fix of CVE-2022-38223.

Affects: w3m 0.5.3+git20230129, 0.5.3+git20230121-1, 0.5.3+git20230121-2
Not Affected version: < 0.5.3+git20220429-1

https://github.com/tats/w3m/issues/268
https://github.com/tats/w3m/pull/273
Comment 1 TEJ RATHI 2023-12-19 10:31:45 UTC 
Created w3m tracking bugs for this issue:

Affects: epel-all [bug 2255209]
Affects: fedora-all [bug 2255208]
Comment 2 TEJ RATHI 2023-12-19 10:40:42 UTC 
Upstream Commit:
https://github.com/tats/w3m/commit/edc602651c506aeeb60544b55534dd1722a340d3
Comment 3 Rene Kita 2023-12-22 10:26:37 UTC 
What's the relevance of the upstream commit here?

Is this about https://github.com/tats/w3m/issues/282 which is addressed in https://github.com/tats/w3m/pull/285 ?