#VU79523 Link following in rpm - CVE-2021-35939
Published: August 15, 2023
Vulnerability identifier: #VU79523
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-35939
CWE-ID: CWE-59
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
rpm
rpm
Software vendor:
rpm-software-management
rpm-software-management
Description
The vulnerability allows a local privileged user to escalate privileges on the system.
The vulnerability exist due to 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 privileged user who owns another ancestor directory could potentially use this flaw to gain root privileges.
Remediation
Install updates from vendor's website.
External links
- https://github.com/rpm-software-management/rpm/pull/1919
- https://bugzilla.redhat.com/show_bug.cgi?id=1964129
- https://github.com/rpm-software-management/rpm/commit/96ec957e281220f8e137a2d5eb23b83a6377d556
- https://access.redhat.com/security/cve/CVE-2021-35939
- https://rpm.org/wiki/Releases/4.18.0
- https://security.gentoo.org/glsa/202210-22