Link following in mercurial (Alpine package)

1) Link following

EUVDB-ID: #VU31407

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-1000115

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

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

Mercurial prior to version 4.3 is vulnerable to a missing symlink check that can malicious repositories to modify files outside the repository

Mitigation

Install update from vendor's website.

Vulnerable software versions

mercurial (Alpine package): 3.7.3-r1 - 4.1.3-r0

CPE2.3

• cpe:2.3:a:alpine:mercurial_alpine_package:3.7.3-r1:*:*:*:*:alpine_linux:*:3.2
• cpe:2.3:a:alpine:mercurial_alpine_package:3.8.2-r0:*:*:*:*:alpine_linux:*:3.4
• cpe:2.3:a:alpine:mercurial_alpine_package:4.0.1-r0:*:*:*:*:alpine_linux:*:3.4

External links

https://git.alpinelinux.org/aports/commit/?id=46f1c492e93cefbba5d56966c46faa646f845510
https://git.alpinelinux.org/aports/commit/?id=cdafec626b8c0da56c2fd216d6c454ccb98540f3
https://git.alpinelinux.org/aports/commit/?id=d01cd6090d5500f9d87d2f4d49148060f00177e8
https://git.alpinelinux.org/aports/commit/?id=acca7b1865fb507a4a9d2350ef569214191f19b9

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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