Man-in-the-middle attack in Git

1) Man-in-the-middle attack

EUVDB-ID: #VU11082

Risk: High

CVSSv3.1: 8.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-1000021

CWE-ID: CWE-300 - Channel Accessible by Non-Endpoint ('Man-in-the-Middle')

Exploit availability: No

Description

The vulnerability allows a remote unauthenticated attacker to execute arbitrary code on the target system.

The weakness exists due to insufficient validation of messages received from a Git server, which could include ANSI escape codes to the terminal on affected Git clients. A remote attacker can trick the victim into sending a request and interact with a malicious Git server and execute arbitrary code.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Git: 2.10.0 - 2.14.2

External links

http://public-inbox.org/git/20180205204312.GB104086@aiede.svl.corp.google.com/

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. However, proof of concept for this vulnerability is available.