CVE-2021-35938
First published: Mon May 24 2021(Updated: )
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.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Rpm Rpm | <4.18.0 | |
| Fedoraproject Fedora | =34 | |
| Redhat Enterprise Linux | =7.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux | =9.0 | |
| redhat/rpm | <4.18.0 | 4.18.0 |
Remedy
https://github.com/rpm-software-management/rpm/commit/25a435e90844ea98fe5eb7bef22c1aecf3a9c033
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Reference Links
- https://access.redhat.com/security/cve/CVE-2021-35938
- https://bugzilla.redhat.com/show_bug.cgi?id=1964114
- https://bugzilla.suse.com/show_bug.cgi?id=1157880
- https://github.com/rpm-software-management/rpm/commit/25a435e90844ea98fe5eb7bef22c1aecf3a9c033
- https://github.com/rpm-software-management/rpm/pull/1919
- https://rpm.org/wiki/Releases/4.18.0
- https://security.gentoo.org/glsa/202210-22
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1977844
- https://access.redhat.com/security/cve/CVE-2021-35937
- https://access.redhat.com/security/cve/CVE-2021-35939
- https://access.redhat.com/errata/RHSA-2024:0435
- https://access.redhat.com/errata/RHSA-2024:0463
- https://access.redhat.com/errata/RHSA-2024:0453
- https://access.redhat.com/errata/RHSA-2024:0424
- https://access.redhat.com/errata/RHSA-2024:0582
- https://access.redhat.com/errata/RHSA-2024:0647
Frequently Asked Questions
What is CVE-2021-35938?
CVE-2021-35938 is a symbolic link issue found in rpm, which allows a local unprivileged user to escalate their privileges on the system.
How does CVE-2021-35938 work?
CVE-2021-35938 occurs when rpm sets the desired permissions and credentials after installing a file, allowing a user to exchange the original file with a symbolic link to a security-critical file.
Which software is affected by CVE-2021-35938?
The software affected by CVE-2021-35938 includes rpm version up to 4.18.0, Fedora 34, Red Hat Enterprise Linux 7.0, 8.0, and 9.0.
What is the severity of CVE-2021-35938?
CVE-2021-35938 has a severity rating of medium with a CVSS score of 6.7.
How can I fix CVE-2021-35938?
To fix CVE-2021-35938, update your rpm software to version 4.18.0 or later.
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