#VU37719 Use-after-free in Debian Linux - CVE-2017-1000421

Vulnerability identifier: #VU37719

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2017-1000421

CWE-ID: CWE-416

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.

Gifsicle gifview 1.89 and older is vulnerable to a use-after-free in the read_gif function resulting potential code execution

Mitigation
Install update from vendor's website.

Vulnerable software versions

Debian Linux: 7.0 - 9.0

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External links
https://github.com/kohler/gifsicle/issues/114
https://lists.debian.org/debian-lts-announce/2018/01/msg00006.html
https://www.debian.org/security/2018/dsa-4084

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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.