Double Free in gd (Alpine package)

1) Double Free

EUVDB-ID: #VU17380

Risk: High

CVSSv3.1: 8.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-6978

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

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

The vulnerability exists due to double free in the gdImage*Ptr() functions in gd_gif_out.c, gd_jpeg.c, and gd_wbmp.c. A remote attacker can trick the victim into opening a specially crafted input, trigger 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 update from vendor's website.

Vulnerable software versions

gd (Alpine package): 2.2.5-r1

External links

http://git.alpinelinux.org/aports/commit/?id=3deb517cec296a32e5b25f1a75a48c2026a44af4
http://git.alpinelinux.org/aports/commit/?id=aad758e364da9a69d0d519b619cc6eb2c7d150f8
http://git.alpinelinux.org/aports/commit/?id=0a3f40e0ea5d2b68f902eb4528b17327939ee400
http://git.alpinelinux.org/aports/commit/?id=2af60a5c6e7e457381ff31c346871e7c51812cfa
http://git.alpinelinux.org/aports/commit/?id=34bc5f16da72bed7c42423c3cfe3cc93fc529c46
http://git.alpinelinux.org/aports/commit/?id=451ff1929d8530ffbceb863acaeb212e545c3080
http://git.alpinelinux.org/aports/commit/?id=478332a5a162445bc68e54ef4138ae2a6af382d8

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. However, proof of concept for this vulnerability is available.