Medium severity · published Aug 25, 2022
CVE-2021-35938
A symbolic link issue was found in rpm
6.7
CVSS
0.5%
EPSS
No
On KEV
Description
A symbolic link issue was found in rpm. It occurs when rpm sets the desired permissions and credentials after installing a file. A local unprivileged user could use this flaw to exchange the original file with a symbolic link to a security-critical file and escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EL
Enterprise Linux · Redhat
7.0; 8.0; 9.0 · source: NVD
FE
Fedora · Fedoraproject
34 · source: NVD
RP
Rpm · Rpm
before 4.18.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-35938
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-35938
Vendor Advisory
https://access.redhat.com/security/cve/CVE-2021-35938
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=1964114
Exploit
https://bugzilla.suse.com/show_bug.cgi?id=1157880
Patch
https://github.com/rpm-software-management/rpm/commit/25a435e90844ea98fe5eb7bef22c1aecf3a9c033
Patch
https://github.com/rpm-software-management/rpm/pull/1919
Release Notes
https://rpm.org/wiki/Releases/4.18.0
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