Exposed dangerous method or function in Ghostscript

Vulnerability identifier: #VU18288

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-3835

CWE-ID: CWE-749

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Ghostscript
Universal components / Libraries / Libraries used by multiple products

Vendor: Artifex Software, Inc.

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due presence of superexec operator within the internal dictionary. A remote attacker can create a specially crafted PDF file, trick the victim into opening, bypass system restrictions of the dSAFER sandbox and access files on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Ghostscript: 9.00 - 9.26

External links
https://packetstormsecurity.com/files/152367/Slackware-Security-Advisory-ghostscript-Updates.html
https://access.redhat.com/errata/RHSA-2019:0652
https://bugs.ghostscript.com/show_bug.cgi?id=700585
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3835
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A43SRQAEHQCKSEMIBINHUNIGHTDCZD7F/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ANBSCZABXQUEQWIKNWJ35IYX24M227EI/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SVERLGEU3OV6RNZ2SIBXREWD3BF5H23N/
https://seclists.org/bugtraq/2019/Apr/4

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

#VU18288 Exposed dangerous method or function in Ghostscript - CVE-2019-3835

Q & A

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