Todd Miller sudo 1.7.2 nsswitch.conf.bak link following

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00

A vulnerability classified as critical was found in Todd Miller sudo 1.7.2 (Operating System Utility Software). Affected by this vulnerability is an unknown functionality of the file /var/tmp/nsswitch.conf.bak. 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, and integrity. The summary by CVE is:

A certain Red Hat script for sudo 1.7.2 on Red Hat Enterprise Linux (RHEL) 5 allows local users to overwrite arbitrary files via a symlink attack on the /var/tmp/nsswitch.conf.bak temporary file.

The weakness was presented 08/07/2012 with Red Hat as not defined advisory (Red Hat Security Advisory). It is possible to read the advisory at rhn.redhat.com. This vulnerability is known as CVE-2012-3440 since 06/14/2012. The exploitation appears to be difficult. Attacking locally is a requirement. The successful exploitation needs a single authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 8 days. During that time the estimated underground price was around $5k-$25k. By approaching the search of inurl:var/tmp/nsswitch.conf.bak it is possible to find vulnerable targets with Google Hacking. The vulnerability scanner Nessus provides a plugin with the ID 68595 (Oracle Linux 5 : sudo (ELSA-2012-1149)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 216052 (VMWare ESX 4.0.0 Patch Release ESX400-201305001 Missing (KB2044240)).

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (77491) and Tenable (68595). See 10100 for similar entry.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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Exploitinginfo

Class: Link following
CWE: CWE-59
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined
Google Hack: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 68595
Nessus Name: Oracle Linux 5 : sudo (ELSA-2012-1149)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 881468
OpenVAS Name: CentOS Update for sudo CESA-2012:1149 centos5
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
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Timelineinfo

06/14/2012 🔍
07/30/2012 +46 days 🔍
08/07/2012 +8 days 🔍
08/07/2012 +0 days 🔍
08/07/2012 +0 days 🔍
08/08/2012 +1 days 🔍
08/08/2012 +0 days 🔍
08/08/2012 +0 days 🔍
08/08/2012 +0 days 🔍
08/14/2012 +6 days 🔍
08/14/2012 +0 days 🔍
07/12/2013 +332 days 🔍
03/27/2021 +2815 days 🔍

Sourcesinfo

Advisory: rhn.redhat.com
Organization: Red Hat
Status: Not defined
Confirmation: 🔍

CVE: CVE-2012-3440 (🔍)
OVAL: 🔍
IAVM: 🔍

X-Force: 77491
Vulnerability Center: 35839 - Red Hat Enterprise Linux 5 Script for Sudo 1.7.2 Allows Local Users to Overwrite Arbitrary Files, Medium
SecurityFocus: 54868 - Todd Miller Sudo Insecure Temporary File Creation Vulnerability
Secunia: 50178 - Red Hat update for sudo, Less Critical
OSVDB: 84492

See also: 🔍

Entryinfo

Created: 08/14/2012 15:22
Updated: 03/27/2021 09:54
Changes: 08/14/2012 15:22 (77), 06/16/2017 09:02 (12), 03/27/2021 09:54 (3)
Complete: 🔍

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