Input validation error in Exim

1) Input validation error

EUVDB-ID: #VU41356

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 - Improper input validation

Exploit availability: No

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

CPE2.3

• cpe:2.3:a:exim:exim:4.00:*:*:*:*:*:*:*
• cpe:2.3:a:exim:exim:4.01:*:*:*:*:*:*:*
• cpe:2.3:a:exim:exim:4.02:*:*:*:*:*:*:*

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.