UNIX symbolic link following in storeBackup - CVE-2020-7040
Published: January 29, 2020 / Updated: May 4, 2021
Vulnerability identifier: #VU24715
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2020-7040
CWE-ID: CWE-61
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Free Software Foundation
Affected software:
storeBackup
storeBackup
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a symlink following issue within the storeBackup.pl in storeBackup, as software relies on the /tmp/storeBackup.lock pathname. A local user can create a specially crafted symbolic link to a critical file on the system and overwrite it with privileges of the application.
Successful exploitation of this vulnerability may result in privilege escalation.
How to mitigate CVE-2020-7040
Install update from vendor's website.
Sources
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00054.html
- http://www.openwall.com/lists/oss-security/2020/01/20/3
- http://www.openwall.com/lists/oss-security/2020/01/21/2
- http://www.openwall.com/lists/oss-security/2020/01/22/2
- http://www.openwall.com/lists/oss-security/2020/01/22/3
- http://www.openwall.com/lists/oss-security/2020/01/23/1
- https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-7040
- https://seclists.org/oss-sec/2020/q1/20