Improper Link Resolution Before File Access (\'Link Following\') in patch (Alpine package)



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-13636
CWE-ID CWE-59
Exploitation vector Local
Public exploit N/A
Vulnerable software
 patch (Alpine package)
Operating systems & Components / Operating system package or component

Vendor Alpine Linux Development Team

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

Install update from vendor's website.

Vulnerable software versions

patch (Alpine package): 2.5.9-r0 - 2.7.6-r2

CPE2.3 External links

https://git.alpinelinux.org/aports/commit/?id=eb88ff152557254bd38fbe358892d73f97a09e6b
https://git.alpinelinux.org/aports/commit/?id=1d883b90c2617f701a473458f6bea95c5488513b
https://git.alpinelinux.org/aports/commit/?id=38b6dd1c340446b8eb31aefaf5396ba65ca94369
https://git.alpinelinux.org/aports/commit/?id=3f413a6b4f89e4d069b26f1e2302a6c914e02b6e
https://git.alpinelinux.org/aports/commit/?id=858c1e50bc7b69a652bedc684cf06dd025afeeab
https://git.alpinelinux.org/aports/commit/?id=88e814fbbdb9a9a335964ae6dac9caa730df1cbf


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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