SB2018111103 - Debian update for ghostscript

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Main Vulnerability Database SB2018111103

SB2018111103 - Debian update for ghostscript

Published: November 11, 2018

Security Bulletin ID SB2018111103
Severity
High
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 secuirty vulnerabilities.


1) Information disclosure (CVE-ID: CVE-2018-11645)

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists in the psi/zfile.c code of Artifex Software Ghostscript due to improper security restrictions. A remote attacker can trick the victim into opening a specially crafted file that submits malicious input and access sensitive information, such as the existence and size of files. 


2) Code Injection (CVE-ID: CVE-2018-17961)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation that allows sandbox bypass via error handler setup vectors. A remote attacker can pass a specially crafted PostScript file to the affected application, inject and execute arbitrary code on the target system.

Note: this vulnerability exists due to insufficient patch for previously fixed Code injection vulnerability (CVE-2018-17183).


3) Security restrictions bypass (CVE-ID: CVE-2018-18073)

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to exposure of system operators in the saved execution stack in an error object. A remote attacker can bypass a sandbox protection mechanism to conduct further attacks.

4) Code injection (CVE-ID: CVE-2018-18284)

The vulnerability allows a remote attacker to bypass the sandbox protection mechanism on the target system.

The vulnerability exists due to the failure of the sandbox protection mechanism of the affected software when the 1Policy operator is used. A remote unauthenticated attacker can trick the victim into accessing a PostScript file that submits malicious input, bypass the sandbox protection mechanism and modify or replace error handlers used by the software, which the attacker could use to inject and execute arbitrary code on the system.


Remediation

Install update from vendor's website.

References