#VU41356 Input validation error in Exim - CVE-2014-2972

Vulnerability identifier: #VU41356

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2014-2972

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Exim
Server applications / Mail servers

Vendor: Exim

Description

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

expand.c in Exim before 4.83 expands mathematical comparisons twice, which allows local users to gain privileges and execute arbitrary commands via a crafted lookup value.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Exim: 4.00 - 4.82

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External links
https://git.exim.org/exim.git/commitdiff/7685ce68148a083d7759e78d01aa5198fc099c44
https://lists.fedoraproject.org/pipermail/package-announce/2014-August/136251.html
https://lists.fedoraproject.org/pipermail/package-announce/2014-August/136264.html
https://www.ubuntu.com/usn/USN-2933-1
https://bugzilla.redhat.com/show_bug.cgi?id=1122552
https://lists.exim.org/lurker/message/20140722.145949.42c043f5.en.html
https://lists.exim.org/lurker/message/20140722.152452.d6c019e8.en.html
https://security.gentoo.org/glsa/201607-12

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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.