Artifex Ghostscript allows attackers to bypass a sandbox protection mechanism by leveraging exposure of system operators in the saved execution stack in an error object.

References

• https://nvd.nist.gov/vuln/detail/CVE-2018-18073
• https://access.redhat.com/errata/RHSA-2018:3834
• https://bugs.chromium.org/p/project-zero/issues/detail?id=1690
• https://bugs.ghostscript.com/show_bug.cgi?id=699927
• https://lists.debian.org/debian-lts-announce/2018/10/msg00013.html
• https://usn.ubuntu.com/3803-1/
• https://www.debian.org/security/2018/dsa-4336
• http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=34cc326eb2c5695833361887fe0b32e8d987741c
• http://packetstormsecurity.com/files/149758/Ghostscript-Exposed-System-Operators.html
• http://www.openwall.com/lists/oss-security/2018/10/10/12