Vulnerability Details : CVE-2021-35939
Potential exploit
It was found that the fix for CVE-2017-7500 and CVE-2017-7501 was incomplete: the check was only implemented for the parent directory of the file to be created. A local unprivileged user who owns another ancestor directory could potentially use this flaw to gain root privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Products affected by CVE-2021-35939
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:a:rpm:rpm:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-35939
0.12%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 33 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-35939
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.7
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
0.8
|
5.9
|
NIST |
CWE ids for CVE-2021-35939
-
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.Assigned by:
- nvd@nist.gov (Secondary)
- secalert@redhat.com (Primary)
References for CVE-2021-35939
-
https://access.redhat.com/security/cve/CVE-2021-35939
CVE-2021-35939- Red Hat Customer PortalThird Party Advisory
-
https://github.com/rpm-software-management/rpm/commit/96ec957e281220f8e137a2d5eb23b83a6377d556
Validate intermediate symlinks during installation, CVE-2021-35939 · rpm-software-management/rpm@96ec957 · GitHubPatch;Third Party Advisory
-
https://rpm.org/wiki/Releases/4.18.0
rpm.org - ReleasesRelease Notes;Vendor Advisory
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https://bugzilla.redhat.com/show_bug.cgi?id=1964129
1964129 – (CVE-2021-35939) CVE-2021-35939 rpm: checks for unsafe symlinks are not performed for intermediary directoriesExploit;Issue Tracking;Third Party Advisory
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https://github.com/rpm-software-management/rpm/pull/1919
First steps towards fixing the symlink CVEs by pmatilai · Pull Request #1919 · rpm-software-management/rpm · GitHubPatch;Third Party Advisory
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https://security.gentoo.org/glsa/202210-22
RPM: Multiple Vulnerabilities (GLSA 202210-22) — Gentoo securityThird Party Advisory
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