#VU18323 Double Free in Patch - CVE-2018-6952

Vulnerability identifier: #VU18323

Vulnerability risk: Medium

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-6952

CWE-ID: CWE-415

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Patch
Server applications / File servers (FTP/HTTP)

Vendor: GNU

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing untrusted input within the another_hunk() function in pch.c. A remote attacker can create a specially crafted file, trick the victim into using in with the affected application, trigger a double free error and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's repository.

Vulnerable software versions

Patch: 2.7.0 - 2.7.6

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External links
https://www.securityfocus.com/bid/103047
https://savannah.gnu.org/bugs/index.php?53133
https://security.gentoo.org/glsa/201904-17

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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.