Heap-based buffer overflow in Ghostscript - CVE-2020-27792

Vulnerability identifier: #VU67506

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-2020-27792

CWE-ID: CWE-122

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to a boundary error within the lp8000_print_page() function in gdevlp8k.c. A remote attacker can trick the victim to open a specially crafted PDF file, trigger a 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.

Ghostscript
Amazon Linux AMI
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for IBM z Systems
Ubuntu
Migration Toolkit for Containers
ghostscript
ghostscript (Ubuntu package)
ghostscript-x (Ubuntu package)
libgs9 (Ubuntu package)
ghostscript (Red Hat package)

Install updates from vendor's website.

Ghostscript - update to 9.50
Migration Toolkit for Containers - update to 1.8.7
ghostscript - update to 8.70-24.27
ghostscript (Ubuntu package) - addressed in versions 9.26~dfsg+00ubuntu0.16.04.14+esm4, 9.26~dfsg+0-0ubuntu0.18.04.17, 9.50~dfsg-5ubuntu4.6, 9.55.0~dfsg1-0ubuntu5.1
ghostscript-x (Ubuntu package) - update to 9.26~dfsg+00ubuntu0.16.04.14+esm4
libgs9 (Ubuntu package) - update to 9.26~dfsg+00ubuntu0.16.04.14+esm4
ghostscript (Red Hat package) - update to 9.27-16.el8_10

• https://bugs.ghostscript.com/show_bug.cgi?id=701844
• https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=4f6bc662909ab79e8fbe9822afb36e8a0eafc2b7
• https://lists.debian.org/debian-lts-announce/2022/09/msg00005.html

• Security restrictions bypass in Ghostscript
• Ubuntu update for ghostscript
• Ubuntu update for ghostscript
• Amazon Linux AMI update for ghostscript
• Red Hat Enterprise Linux 8 update for ghostscript
• Multiple vulnerabilities in Migration Toolkit for Containers 1.8