Out-of-bounds write in Ghostscript - CVE-2020-36773

Vulnerability identifier: #VU93860

CSH Severity: High

CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-36773

CWE-ID: CWE-787

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input in devices/vector/gdevtxtw.c. A remote attacker can create a specially crafted file, trick the victim into opening it using the affected software, trigger an out-of-bounds write and execute arbitrary code on the target system.

Ghostscript
openEuler
ghostscript
ghostscript-debugsource
ghostscript-tools-dvipdf
ghostscript-debuginfo
ghostscript-devel
ghostscript-help

Install updates from vendor's website.

Ghostscript - update to 9.53.0
ghostscript - addressed in versions 9.52-11, 9.52-13
ghostscript-debugsource - addressed in versions 9.52-11, 9.52-13
ghostscript-tools-dvipdf - addressed in versions 9.52-11, 9.52-13
ghostscript-debuginfo - addressed in versions 9.52-11, 9.52-13
ghostscript-devel - addressed in versions 9.52-11, 9.52-13
ghostscript-help - addressed in versions 9.52-11, 9.52-13

• https://bugs.ghostscript.com/show_bug.cgi?id=702229
• https://git.ghostscript.com/?p=ghostpdl.git%3Ba=commit%3Bh=8c7bd787defa071c96289b7da9397f673fddb874
• https://bugzilla.opensuse.org/show_bug.cgi?id=1177922
• https://github.com/ArtifexSoftware/ghostpdl-downloads/releases/tag/gs9530

• openEuler 20.03 LTS SP1 update for ghostscript
• openEuler 20.03 LTS SP4 update for ghostscript
• Remote code execution in Artifex Ghostscript