Privilege escalation in storeBackup

1) UNIX symbolic link following

EUVDB-ID: #VU24715

Risk: Low

CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-7040

CWE-ID: CWE-61 - UNIX Symbolic Link (Symlink) Following

Exploit availability: No

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

storeBackup: 2.0 - 3.5

External links

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
http://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-7040
http://seclists.org/oss-sec/2020/q1/20

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.