Privilege escalation in GNU patch



Risk Low
Patch available NO
Number of vulnerabilities 1
CVE-ID CVE-2019-13636
CWE-ID CWE-59
Exploitation vector Local
Public exploit N/A
Vulnerable software
 GNU patch
Operating systems & Components / Operating system package or component

Vendor GNU

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Improper Link Resolution Before File Access ('Link Following')

EUVDB-ID: #VU19283

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-13636

CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Exploit availability: No

Description

The vulnerability allows a local user to gain unauthorized access to files or directories on a targeted system.

The vulnerability exists due to the software mishandles the following of symlinks in certain cases other than input files in the "inp.c" and "util.c" files. A local authenticated user can gain unauthorized access to read or modify files and directories on a targeted system.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

GNU patch: 2.1 - 2.7.6

CPE2.3 External links

https://git.savannah.gnu.org/cgit/patch.git/commit/?id=dce4683cbbe107a95f1f0d45fabc304acfb5d71a
https://lists.debian.org/debian-lts-announce/2019/07/msg00016.html


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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