Medium severity · published Dec 21, 2023
CVE-2023-4255
An out-of-bounds write issue has been discovered in the backspace handling of the checkType() function in etc.c within the W3M application
5.5
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 25% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EP
Extra Packages For Enterprise Linux · Fedoraproject
8.0 · source: NVD
FE
Fedora · Fedoraproject
39 · source: NVD
W3
W3m · Tats
0.5.3+git20230121-1; 0.5.3+git20230121-2; 0.5.3+git20230129 · source: NVD
Affected product
EP
Extra Packages For Enterprise Linux
Fedoraproject
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-4255
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-4255
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2255207
Patch
https://github.com/tats/w3m/commit/edc602651c506aeeb60544b55534dd1722a340d3
Exploit
https://github.com/tats/w3m/issues/268
Issue Tracking
https://github.com/tats/w3m/pull/273
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AULOBQJLXE2KCT5UVQMKGEFL4GFIAOED/
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MKFZQUK7FPWWJQYICDZZ4YWIPUPQ2D3R/
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