An update for ghostscript is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The Ghostscript suite contains utilities for rendering PostScript and PDF documents. Ghostscript translates PostScript code to common bitmap formats so that the code can be displayed or printed.

Security Fix(es) :

* It was discovered that the ghostscript /invalidaccess checks fail under certain conditions. An attacker could possibly exploit this to bypass the -dSAFER protection and, for example, execute arbitrary shell commands via a specially crafted PostScript document.
(CVE-2018-16509)

* ghostscript: LockDistillerParams type confusion (699656) (CVE-2018-15910)

* ghostscript: .definemodifiedfont memory corruption if /typecheck is handled (699668) (CVE-2018-16542)

* ghostscript: Stack-based out-of-bounds write in pdf_set_text_matrix function in gdevpdts.c (CVE-2018-10194)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Red Hat would like to thank Tavis Ormandy (Google Project Zero) for reporting CVE-2018-16509, CVE-2018-15910, and CVE-2018-16542.

The remote host is affected by the vulnerability described in GLSA-201811-12 (GPL Ghostscript: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in GPL Ghostscript. Please       review the CVE identifiers referenced below for additional information.
  Impact :

    A context-dependent attacker could entice a user to open a specially       crafted PostScript file or PDF document using GPL Ghostscript possibly       resulting in the execution of arbitrary code with the privileges of the       process, a Denial of Service condition, or other unspecified impacts,   Workaround :

    There is no known workaround at this time.

The remote Oracle Linux 6 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2018-3760 advisory.

    - It was found that the fix for CVE-2018-16509 was not complete, the missing       pieces added into ghostscript-CVE-2018-16509.patch
    - Resolves: #1641124 - CVE-2018-16509 ghostscript: /invalidaccess bypass after failed restore

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

It was discovered that the ghostscript /invalidaccess checks fail under certain conditions. An attacker could possibly exploit this to bypass the -dSAFER protection and, for example, execute arbitrary shell commands via a specially crafted PostScript document.(CVE-2018-16509)

This update for ghostscript to version 9.25 fixes the following issues :

These security issues were fixed :

CVE-2018-17183: Remote attackers were be able to supply crafted PostScript to potentially overwrite or replace error handlers to inject code (bsc#1109105)

CVE-2018-15909: Prevent type confusion using the .shfill operator that could have been used by attackers able to supply crafted PostScript files to crash the interpreter or potentially execute code (bsc#1106172).

CVE-2018-15908: Prevent attackers that are able to supply malicious PostScript files to bypass .tempfile restrictions and write files (bsc#1106171).

CVE-2018-15910: Prevent a type confusion in the LockDistillerParams parameter that could have been used to crash the interpreter or execute code (bsc#1106173).

CVE-2018-15911: Prevent use uninitialized memory access in the aesdecode operator that could have been used to crash the interpreter or potentially execute code (bsc#1106195).

CVE-2018-16513: Prevent a type confusion in the setcolor function that could have been used to crash the interpreter or possibly have unspecified other impact (bsc#1107412).

CVE-2018-16509: Incorrect 'restoration of privilege' checking during handling of /invalidaccess exceptions could be have been used by attackers able to supply crafted PostScript to execute code using the 'pipe' instruction (bsc#1107410).

CVE-2018-16510: Incorrect exec stack handling in the 'CS' and 'SC' PDF primitives could have been used by remote attackers able to supply crafted PDFs to crash the interpreter or possibly have unspecified other impact (bsc#1107411).

CVE-2018-16542: Prevent attackers able to supply crafted PostScript files from using insufficient interpreter stack-size checking during error handling to crash the interpreter (bsc#1107413).

CVE-2018-16541: Prevent attackers able to supply crafted PostScript files from using incorrect free logic in pagedevice replacement to crash the interpreter (bsc#1107421).

CVE-2018-16540: Prevent use-after-free in copydevice handling that could have been used to crash the interpreter or possibly have unspecified other impact (bsc#1107420).

CVE-2018-16539: Prevent attackers able to supply crafted PostScript files from using incorrect access checking in temp file handling to disclose contents of files on the system otherwise not readable (bsc#1107422).

CVE-2018-16543: gssetresolution and gsgetresolution allowed attackers to have an unspecified impact (bsc#1107423).

CVE-2018-16511: A type confusion in 'ztype' could have been used by remote attackers able to supply crafted PostScript to crash the interpreter or possibly have unspecified other impact (bsc#1107426).

CVE-2018-16585: The .setdistillerkeys PostScript command was accepted even though it is not intended for use during document processing (e.g., after the startup phase). This lead to memory corruption, allowing remote attackers able to supply crafted PostScript to crash the interpreter or possibly have unspecified other impact (bsc#1107581).

CVE-2018-16802: Incorrect 'restoration of privilege' checking when running out of stack during exception handling could have been 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 (bsc#1108027).

The update package also includes non-security fixes. See advisory for details.

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

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has ghostscript packages installed that are affected by multiple vulnerabilities:

  - The set_text_distance function in     devices/vector/gdevpdts.c in the pdfwrite component in     Artifex Ghostscript through 9.22 does not prevent     overflows in text-positioning calculation, which allows     remote attackers to cause a denial of service     (application crash) or possibly have unspecified other     impact via a crafted PDF document. (CVE-2018-10194)

  - It was discovered that the type of the     LockDistillerParams parameter is not properly verified.
    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. (CVE-2018-15910)

  - It was discovered that the ghostscript /invalidaccess     checks fail under certain conditions. An attacker could     possibly exploit this to bypass the -dSAFER protection     and, for example, execute arbitrary shell commands via a     specially crafted PostScript document. (CVE-2018-16509)

  - It was discovered that ghostscript did not properly     handle certain stack overflow error conditions. 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. (CVE-2018-16542)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	名稱	產品	系列	已發布	已更新	嚴重性
118128	RHEL 7 : ghostscript (RHSA-2018:2918)	Nessus	Red Hat Local Security Checks	2018/10/16	2024/7/31	high
119132	GLSA-201811-12 : GPL Ghostscript: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2018/11/26	2024/7/19	critical
119328	Oracle Linux 6 : ghostscript (ELSA-2018-3760)	Nessus	Oracle Linux Local Security Checks	2018/12/4	2024/10/23	high
119815	Amazon Linux AMI : ghostscript (ALAS-2018-1137)	Nessus	Amazon Linux Local Security Checks	2018/12/21	2024/7/15	high
120116	SUSE SLED15 / SLES15 Security Update : ghostscript (SUSE-SU-2018:2976-1)	Nessus	SuSE Local Security Checks	2019/1/2	2024/7/10	high
127204	NewStart CGSL CORE 5.04 / MAIN 5.04 : ghostscript Multiple Vulnerabilities (NS-SA-2019-0035)	Nessus	NewStart CGSL Local Security Checks	2019/8/12	2021/1/14	high

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