Some vulnerabilities were discovered in ghostscript, an interpreter for the PostScript language and for PDF.

CVE-2018-19134

The setpattern operator did not properly validate certain types. A specially crafted PostScript document could exploit this to crash Ghostscript or, possibly, execute arbitrary code in the context of the Ghostscript process. This is a type confusion issue because of failure to check whether the Implementation of a pattern dictionary was a structure type.

CVE-2018-19478

Attempting to open a carefully crafted PDF file results in long-running computation. A sufficiently bad page tree can lead to us taking significant amounts of time when checking the tree for recursion.

For Debian 8 'Jessie', these problems have been fixed in version 9.06~dfsg-2+deb8u13.

We recommend that you upgrade your ghostscript packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the ghostscript package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - It was discovered that the ghostscript .tempfile     function did not properly handle file permissions. An     attacker could possibly exploit this to exploit this to     bypass the -dSAFER protection and delete files or     disclose their content via a specially crafted     PostScript document.i1/4^CVE-2018-15908i1/4%0

  - It was discovered that the ghostscript .shfill operator     did not properly validate certain types. An attacker     could possibly exploit this to bypass the -dSAFER     protection and crash ghostscript or, possibly, execute     arbitrary code in the ghostscript context via a     specially crafted PostScript     document.i1/4^CVE-2018-15909i1/4%0

  - It was discovered that ghostscript did not properly     verify the key used in aesdecode. An attacker could     possibly exploit this to bypass the -dSAFER protection     and crash ghostscript or, possibly, execute arbitrary     code in the ghostscript context via a specially crafted     PostScript document.i1/4^CVE-2018-15911i1/4%0

  - It was discovered that the ghostscript .type operator     did not properly validate its operands. A specially     crafted PostScript document could exploit this to crash     ghostscript or, possibly, execute arbitrary code in the     context of the ghostscript process.i1/4^CVE-2018-16511i1/4%0

  - It was discovered that the ghostscript did not properly     restrict access to files open prior to enabling the
    -dSAFER mode. An attacker could possibly exploit this     to bypass the -dSAFER protection and disclose the     content of affected files via a specially crafted     PostScript document.i1/4^CVE-2018-16539i1/4%0

  - It was discovered that the ghostscript device cleanup     did not properly handle devices replaced with a null     device. An attacker could possibly exploit this to     bypass the -dSAFER protection and crash ghostscript or,     possibly, execute arbitrary code in the ghostscript     context via a specially crafted PostScript     document.i1/4^CVE-2018-16541i1/4%0

  - An issue was discovered in Artifex Ghostscript before     9.25. Incorrect 'restoration of privilege' checking     when running out of stack during exception handling     could be used by attackers able to supply crafted     PostScript to execute code using the 'pipe'     instruction. This is due to an incomplete fix for     CVE-2018-16509.i1/4^CVE-2018-16802i1/4%0

  - 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.i1/4^CVE-2018-16863i1/4%0

  - Artifex Ghostscript before 9.25 allowed a user-writable     error exception table, which could be used by remote     attackers able to supply crafted PostScript to     potentially overwrite or replace error handlers to     inject code.i1/4^CVE-2018-17183i1/4%0

  - Artifex Ghostscript 9.25 and earlier allows attackers     to bypass a sandbox protection mechanism via vectors     involving errorhandler setup. NOTE: this issue exists     because of an incomplete fix for     CVE-2018-17183.i1/4^CVE-2018-17961i1/4%0

  - 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.i1/4^CVE-2018-18073i1/4%0

  - Artifex Ghostscript 9.25 and earlier allows attackers     to bypass a sandbox protection mechanism via vectors     involving the 1Policy operator.i1/4^CVE-2018-18284i1/4%0

  - In Artifex Ghostscript through 9.25, the setpattern     operator did not properly validate certain types. A     specially crafted PostScript document could exploit     this to crash Ghostscript or, possibly, execute     arbitrary code in the context of the Ghostscript     process. This is a type confusion issue because of     failure to check whether the Implementation of a     pattern dictionary was a structure     type.i1/4^CVE-2018-19134i1/4%0

  - An issue was discovered in Artifex Ghostscript before     9.26. LockSafetyParams is not checked correctly if     another device is used.i1/4^CVE-2018-19409i1/4%0

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	名稱	產品	系列	已發布	已更新	嚴重性
119890	Debian DLA-1620-1 : ghostscript security update	Nessus	Debian Local Security Checks	2018/12/28	2024/7/12	high
119901	EulerOS Virtualization 2.5.2 : ghostscript (EulerOS-SA-2018-1412)	Nessus	Huawei Local Security Checks	2018/12/28	2022/5/26	critical
123891	EulerOS Virtualization 2.5.3 : ghostscript (EulerOS-SA-2019-1205)	Nessus	Huawei Local Security Checks	2019/4/9	2022/5/20	critical

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