Artifex Ghostscript up to 9.24 Incomplete Fix access control

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.4	$0-$5k	0.00

Summaryinfo

A vulnerability identified as critical has been detected in Artifex Ghostscript up to 9.24. The affected element is an unknown function of the component Incomplete Fix. This manipulation causes access control. This vulnerability is handled as CVE-2018-16802. It is possible to launch the attack on the local host. There is not any exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in Artifex Ghostscript up to 9.24 (Document Processing Software). It has been declared as critical. Affected by this vulnerability is some unknown functionality of the component Incomplete Fix. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The bug was discovered 09/09/2018. The weakness was released 09/10/2018 with Semmle as confirmed mailinglist post (oss-sec). It is possible to read the advisory at seclists.org. This vulnerability is known as CVE-2018-16802 since 09/10/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 117487 (Debian DLA-1504-1 : ghostscript security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171620 (SUSE Enterprise Linux Security Update for ghostscript (SUSE-SU-2018:2975-1)).

Upgrading to version 9.25 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.ghostscript.com. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published 4 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (117487) and SecurityFocus (BID 106278†). Entries connected to this vulnerability are available at VDB-118612, VDB-123287, VDB-123288 and VDB-123289. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Document Processing Software

Vendor

• Artifex

Name

• Ghostscript

Version

• 9.0
• 9.1
• 9.2
• 9.3
• 9.4
• 9.5
• 9.6
• 9.7
• 9.8
• 9.9
• 9.10
• 9.11
• 9.12
• 9.13
• 9.14
• 9.15
• 9.16
• 9.17
• 9.18
• 9.19
• 9.20
• 9.21
• 9.22
• 9.23
• 9.24

License

• free

Website

• Vendor: https://artifex.com/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 117487
Nessus Name: Debian DLA-1504-1 : ghostscript security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Ghostscript 9.25
Patch: 5812b1b78fc4d36fdc293b7859de69241140d590

Timelineinfo

09/09/2018 🔍
09/10/2018 +0 days 🔍
09/10/2018 +0 days 🔍
09/10/2018 +0 days 🔍
09/11/2018 +1 days 🔍
09/13/2018 +2 days 🔍
09/14/2018 +1 days 🔍
12/20/2018 +97 days 🔍
05/08/2023 +1600 days 🔍

Sourcesinfo

Vendor: artifex.com

Advisory: RHSA-2018:3834
Organization: Semmle
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-16802 (🔍)
GCVE (CVE): GCVE-0-2018-16802
GCVE (VulDB): GCVE-100-123811

OVAL: 🔍

SecurityFocus: 106278 - Ghostscript CVE-2018-19134 Remote Code Execution Vulnerability

See also: 🔍

Entryinfo

Created: 09/11/2018 07:09
Updated: 05/08/2023 08:56
Changes: 09/11/2018 07:09 (80), 03/22/2020 11:04 (5), 05/08/2023 08:56 (5)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

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