Heap-based buffer overflow in gd (Alpine package)

1) Heap-based buffer overflow

EUVDB-ID: #VU32245

Risk: High

CVSSv3.1: 7.7 [AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-5766

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in Integer overflow in the _gd2GetHeader function in gd_gd2.c in the GD Graphics Library (aka libgd) before 2.2.3, as used in PHP before 5.5.37, 5.6.x before 5.6.23, and 7.x before 7.0.8,. A remote attacker can use crafted chunk dimensions in an image. to trigger heap-based buffer overflow 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): 2.1.1-r1

External links

http://git.alpinelinux.org/aports/commit/?id=262e2cf8cb01d5ffc1f8c10a3148df77981d5564
http://git.alpinelinux.org/aports/commit/?id=d1df1621cd8cdf645c22b9cc6256957208c6ff69
http://git.alpinelinux.org/aports/commit/?id=b977ac9875306ca4c7da72609ffc99410c1cb123
http://git.alpinelinux.org/aports/commit/?id=4b52b89e94d238b1bb241c3c3f7a3d546b546399

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.