Command execution in Mercurial

1) OS command injection

EUVDB-ID: #VU10849

Risk: Low

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-17458

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The weakness exists due to cross repositories modification. A remote attacker can send a specially crafted mercurial repository and trigger arbitrary commands on a client during commands such as clone or update.

Mitigation

Update to version 4.4.1.

Vulnerable software versions

Mercurial: 4.0 - 4.4

External links

http://bz.mercurial-scm.org/show_bug.cgi?id=5730

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.