CUPS 1.7.0/1.7.1/1.7.2/1.7.3 get_file link following

CVSS Meta Temp Score
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CTI Interest Score
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4.2$0-$5k0.00

A vulnerability, which was classified as problematic, has been found in CUPS 1.7.0/1.7.1/1.7.2/1.7.3 (Printing Software). This issue affects the function get_file. The manipulation with an unknown input leads to a link following vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, and integrity. The summary by CVE is:

The web interface in CUPS before 1.7.4 allows local users in the lp group to read arbitrary files via a symlink attack on a file in /var/cache/cups/rss/.

The weakness was disclosed 07/03/2014 by Tim Waug with Red Hat Security Response Team as STR #4450 as confirmed bug report (Website). It is possible to read the advisory at cups.org. The identification of this vulnerability is CVE-2014-3537 since 05/14/2014. Attacking locally is a requirement. The successful exploitation needs a simple authentication. Technical details as well as a exploit are known.

It is declared as highly functional. The vulnerability scanner Nessus provides a plugin with the ID 77149 (CUPS 1.7.x < 1.7.5 'get_file' Function Symlink Handling Info Disclosure), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc. and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 350813 (Amazon Linux Security Advisory for cups: AL2012-2015-018). The advisory illustrates:

This is not exploitable out-of-the-box as we disable the web interface by default.

Upgrading to version 1.7.4 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at cups.org. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (94749) and Tenable (77149). The entries 67241, 68003 and 63000 are pretty similar.

Productinfo

Type

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
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CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.4
VulDB Temp Score: 4.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

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

Local: Yes
Remote: No

Availability: 🔍
Status: Highly functional

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 77149
Nessus Name: CUPS 1.7.x < 1.7.5 'get_file' Function Symlink Handling Info Disclosure
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 864641
OpenVAS Name: Fedora Update for cups FEDORA-2014-8752
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Upgrade: CUPS 1.7.4
Patch: cups.org

Timelineinfo

05/14/2014 🔍
07/03/2014 +50 days 🔍
07/03/2014 +0 days 🔍
07/18/2014 +15 days 🔍
07/19/2014 +1 days 🔍
07/19/2014 +0 days 🔍
07/19/2014 +0 days 🔍
07/23/2014 +4 days 🔍
08/12/2014 +20 days 🔍
05/02/2019 +1724 days 🔍

Sourcesinfo

Advisory: STR #4450
Researcher: Tim Waug
Organization: Red Hat Security Response Team
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-3537 (🔍)
OVAL: 🔍

X-Force: 94749 - CUPS interface privilege escalation, Low Risk
SecurityTracker: 1030611
SecurityFocus: 68788 - CUPS Web Interface CVE-2014-3537 Local Privilege Escalation Vulnerability
Secunia: 59945 - CUPS Symlink Information Disclosure Weaknesses, Not Critical

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 07/19/2014 20:23
Updated: 05/02/2019 16:31
Changes: 07/19/2014 20:23 (87), 05/02/2019 16:31 (2)
Complete: 🔍

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