CUPS 1.7.0/1.7.1 lppasswd systemv/llpasswd.c cupsUser link following
|CVSS Meta Temp Score|
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|Current Exploit Price (≈)|
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|CTI Interest Score|
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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 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..
Applying the patch str4319.patch is able to eliminate this problem. The bugfix is ready for download at cups.org.
CVSSv3VulDB Meta Base Score: 8.4
VulDB Meta Temp Score: 7.3
VulDB Base Score: 8.4
VulDB Temp Score: 7.3
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ExploitingClass: Link following
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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: 🔍
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OpenVAS ID: 841688
OpenVAS Name: Ubuntu Update for cups USN-2082-1
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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 🔍
06/09/2021 +2661 days 🔍
SourcesAdvisory: STR #4319
Researcher: Jann Horn
CVE: CVE-2013-6891 (🔍)
X-Force: 90628 - CUPS lppasswd.c privilege escalation, High Risk
Vulnerability Center: 43120 - Cups Before 1.7.1 Local File System Read Vulnerability via a Modified HOME Environment Variable, Low
SecurityFocus: 64985 - cups 'systemv/lppasswd.c' Local Privilege Escalation Vulnerability
Secunia: 56531 - Ubuntu update for cups, Not Critical
EntryCreated: 02/25/2014 09:18 AM
Updated: 06/09/2021 08:03 PM
Changes: 02/25/2014 09:18 AM (79), 05/20/2017 10:15 AM (5), 06/09/2021 08:03 PM (3)
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