Critical severity · published Dec 19, 2022
CVE-2021-33640
After tar_close(), libtar.c releases the memory pointed to by pointer t
9.8
CVSS
0.7%
EPSS
No
On KEV
Description
After tar_close(), libtar.c releases the memory pointed to by pointer t. After tar_close() is called in the list() function, it continues to use pointer t: free_longlink_longname(t->th_buf) . As a result, the released memory is used (use-after-free).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FE
Fedora · Fedoraproject
36; 37 · source: NVD
OP
Openeuler · Openatom
20.03; 20.03; 22.03 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-33640
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-33640
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S4PJRCJLEAWN2EKXGLSOBTL7O57V7NC/
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7WX5YE66CT7Y5C2HTHXSFDKQWYWYWJ2T/
Vendor Advisory
https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2021-33640&packageName=libtar
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