Medium severity · published Sep 9, 2022
CVE-2021-40648
In man2html 1.6g, a filename can be created to overwrite the previous size parameter of the next chunk and the fd, bk, fd_nextsize, bk_nextsize of the current chunk
5.5
CVSS
0.3%
EPSS
No
On KEV
Description
In man2html 1.6g, a filename can be created to overwrite the previous size parameter of the next chunk and the fd, bk, fd_nextsize, bk_nextsize of the current chunk. The next chunk is then freed later on, causing a freeing of an arbitrary amount of memory.
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 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Man2html · Man2html Project
1.6g · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-40648
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-40648
Exploit
https://gist.github.com/untaman/cb58123fe89fc65e3984165db5d40933
More from Man2html
5.5
CVE-2021-40647
In man2html 1.6g, a specific string being read in from a file will overwrite the size parameter in the top chunk of the heap