#VU30720 Improper Certificate Validation in Mercurial - CVE-2010-4237

Vulnerability identifier: #VU30720

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2010-4237

CWE-ID: CWE-295

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mercurial
Client/Desktop applications / Other client software

Vendor: Mercurial

Description

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

Mercurial before 1.6.4 fails to verify the Common Name field of SSL certificates which allows remote attackers who acquire a certificate signed by a Certificate Authority to perform a man-in-the-middle attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Mercurial: 1.6.1 - 1.6.3

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External links
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=598841
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2010-4237
https://bz.mercurial-scm.org/show_bug.cgi?id=2407
https://security-tracker.debian.org/tracker/CVE-2010-4237

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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.