#VU39635 Out-of-bounds write in Debian Linux - CVE-2017-6307

Vulnerability identifier: #VU39635

Vulnerability risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2017-6307

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Debian Linux
Operating systems & Components / Operating system

Vendor: Debian

Description

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

An issue was discovered in tnef before 1.4.13. Two OOB Writes have been identified in src/mapi_attr.c:mapi_attr_read(). These might lead to invalid read and write operations, controlled by an attacker.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Debian Linux: 8.0

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External links
https://www.debian.org/security/2017/dsa-3798
https://www.securityfocus.com/bid/96427
https://github.com/verdammelt/tnef/blob/master/ChangeLog
https://github.com/verdammelt/tnef/commit/1a17af1ed0c791aec44dbdc9eab91218cc1e335a
https://security.gentoo.org/glsa/201708-02
https://www.x41-dsec.de/lab/advisories/x41-2017-004-tnef/

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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.