It was found that RHSA-2018:2918 did not fully fix CVE-2018-16509. An attacker could possibly exploit another variant of the flaw and bypass the -dSAFER protection to, for example, execute arbitrary shell commands via a specially crafted PostScript document. This only affects ghostscript 9.07 as shipped with Red Hat Enterprise Linux 7.

References

• https://nvd.nist.gov/vuln/detail/CVE-2018-16863
• https://access.redhat.com/errata/RHSA-2018:3761
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16863
• http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=520bb0ea7519
• http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=5516c614dc33
• http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=78911a01b67d
• http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=79cccf641486
• https://access.redhat.com/security/cve/CVE-2018-16863
• https://bugzilla.redhat.com/show_bug.cgi?id=1652893
• http://git.ghostscript.com/?p=ghostpdl.git%3Ba=commit%3Bh=520bb0ea7519
• http://git.ghostscript.com/?p=ghostpdl.git%3Ba=commit%3Bh=5516c614dc33
• http://git.ghostscript.com/?p=ghostpdl.git%3Ba=commit%3Bh=78911a01b67d
• http://git.ghostscript.com/?p=ghostpdl.git%3Ba=commit%3Bh=79cccf641486