This security advisory describes one low risk vulnerability.

1) UNIX symbolic link following

Severity: Low

CVSSv3:
4.6 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C] [PCI]

CVE-ID:
CVE-2019-12779

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 because software uses predictable filenames (under /dev/shm and /tmp) without O_EXCL in libqb before 1.0.5. 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 updates from vendor’s website.

Vulnerable software versions

libqb (Red Hat package):
0.17.1-1.el7_1

Red Hat Enterprise Linux for Power, little endian:
7

Red Hat Enterprise Linux for Power, big endian:
7

Red Hat Enterprise Linux for IBM z Systems:
7

Red Hat Enterprise Linux for Scientific Computing:
7

Red Hat Enterprise Linux Desktop:
7

Red Hat Enterprise Linux Workstation:
7

Red Hat Enterprise Linux Server:
7

CPE
External links

https://access.redhat.com/errata/RHSA-2020:1189

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.





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