Vulnerability identifier: #VU33446

Vulnerability risk: High

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-2017-6349

CWE-ID: CWE-190

Exploitation vector: Network

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

An integer overflow at a u_read_undo memory allocation site would occur for vim before patch 8.0.0377, if it does not properly validate values for tree length when reading a corrupted undo file, which may lead to resultant buffer overflows.

Mitigation
Install update from vendor's website.

External links
http://www.securityfocus.com/bid/96451
http://www.securitytracker.com/id/1037949
http://github.com/vim/vim/commit/3eb1637b1bba19519885dd6d377bd5596e91d22c
http://groups.google.com/forum/#!topic/vim_dev/LAgsTcdSfNA
http://groups.google.com/forum/#!topic/vim_dev/QPZc0CY9j3Y
http://security.gentoo.org/glsa/201706-26
http://usn.ubuntu.com/4309-1/

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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.