CUPS 1.7.0/1.7.1 lppasswd systemv/llpasswd.c cupsUser link following

CVSS Meta Temp Score
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CTI Interest Score
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7.3$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in CUPS 1.7.0/1.7.1. The affected element is the function cupsUser of the file systemv/llpasswd.c of the component lppasswd. This manipulation causes link following. This vulnerability appears as CVE-2013-6891. There is no available exploit. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability classified as critical was found in CUPS 1.7.0/1.7.1 (Printing Software). Affected by this vulnerability is the function cupsUser of the file systemv/llpasswd.c of the component lppasswd. The manipulation with an unknown input leads to a link following vulnerability. The CWE definition for the vulnerability is CWE-59. The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

lppasswd in CUPS before 1.7.1, when running with setuid privileges, allows local users to read portions of arbitrary files via a modified HOME environment variable and a symlink attack involving .cups/client.conf.

The weakness was presented 01/10/2014 by Jann Horn as STR #4319 as confirmed bug report (Website). It is possible to read the advisory at cups.org. This vulnerability is known as CVE-2013-6891 since 11/28/2013. The exploitation appears to be easy. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 71977 (CUPS 1.6.x >= 1.6.4 / 1.7.x < 1.7.1 lppasswd Information Disclosure), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc.. The commercial vulnerability scanner Qualys is able to test this issue with plugin 195813 (Ubuntu Security Notification for Cups Vulnerability (USN-2082-1)).

Applying the patch str4319.patch is able to eliminate this problem. The bugfix is ready for download at cups.org.

The vulnerability is also documented in the databases at X-Force (90628), Tenable (71977), SecurityFocus (BID 64985†), Secunia (SA56531†) and Vulnerability Center (SBV-43120†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.4
VulDB Meta Temp Score: 7.3

VulDB Base Score: 8.4
VulDB Temp Score: 7.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Link following
CWE: CWE-59
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 71977
Nessus Name: CUPS 1.6.x >= 1.6.4 / 1.7.x < 1.7.1 lppasswd Information Disclosure
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 841688
OpenVAS Name: Ubuntu Update for cups USN-2082-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: str4319.patch

Timelineinfo

11/28/2013 🔍
12/19/2013 +21 days 🔍
12/19/2013 +0 days 🔍
01/10/2014 +22 days 🔍
01/15/2014 +5 days 🔍
01/16/2014 +1 days 🔍
01/25/2014 +9 days 🔍
02/03/2014 +9 days 🔍
02/25/2014 +22 days 🔍
12/23/2024 +3954 days 🔍

Sourcesinfo

Advisory: STR #4319
Researcher: Jann Horn
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2013-6891 (🔍)
GCVE (CVE): GCVE-0-2013-6891
GCVE (VulDB): GCVE-100-12403

OVAL: 🔍

X-Force: 90628 - CUPS lppasswd.c privilege escalation, High Risk
SecurityFocus: 64985 - cups 'systemv/lppasswd.c' Local Privilege Escalation Vulnerability
Secunia: 56531 - Ubuntu update for cups, Not Critical
Vulnerability Center: 43120 - Cups Before 1.7.1 Local File System Read Vulnerability via a Modified HOME Environment Variable, Low

Entryinfo

Created: 02/25/2014 09:18
Updated: 12/23/2024 03:39
Changes: 02/25/2014 09:18 (79), 05/20/2017 10:15 (5), 06/09/2021 20:03 (3), 12/23/2024 03:39 (16)
Complete: 🔍
Committer: olku
Cache ID: 216:68E:103

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

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