An issue was discovered in Artifex Ghostscript before 9.24. Incorrect "restoration of privilege" checking during handling of /invalidaccess exceptions could be used by attackers able to supply crafted PostScript to execute code using the "pipe" instruction.

References

• https://nvd.nist.gov/vuln/detail/CVE-2018-16509
• https://access.redhat.com/errata/RHSA-2018:2918
• https://access.redhat.com/errata/RHSA-2018:3760
• https://bugs.ghostscript.com/show_bug.cgi?id=699654
• https://lists.debian.org/debian-lts-announce/2018/09/msg00015.html
• https://security.gentoo.org/glsa/201811-12
• https://usn.ubuntu.com/3768-1/
• https://www.artifex.com/news/ghostscript-security-resolved/
• https://www.debian.org/security/2018/dsa-4294
• https://www.exploit-db.com/exploits/45369/
• http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=5516c614dc33662a2afdc377159f70218e67bde5
• http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=78911a01b67d590b4a91afac2e8417360b934156
• http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=79cccf641486a6595c43f1de1cd7ade696020a31
• http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=520bb0ea7519aa3e79db78aaf0589dae02103764
• http://seclists.org/oss-sec/2018/q3/142
• http://www.securityfocus.com/bid/105122