libssh 0.4.7/0.4.8/0.5.0/0.5.1/0.5.2 keys.c denial of service

EntryHistoryDiffjsonxmlCTI

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.
5.1	$0-$5k	0.00

A vulnerability was found in libssh 0.4.7/0.4.8/0.5.0/0.5.1/0.5.2. It has been declared as problematic. This vulnerability affects an unknown functionality of the file keys.c. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

The (1) publickey_make_dss, (2) publickey_make_rsa, (3) signature_from_string, (4) ssh_do_sign, and (5) ssh_sign_session_id functions in keys.c in libssh before 0.5.3 free "an invalid pointer on an error path," which might allow remote attackers cause a denial of service (crash) via unspecified vectors.

The weakness was released 11/30/2012 by Florian Weimer with Red Hat Product Security Team as Bug 871617 as not defined bug report (Bugzilla). The advisory is available at bugzilla.redhat.com. This vulnerability was named CVE-2012-4561 since 08/21/2012. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 63125 (Debian DSA-2577-1 : libssh - several vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 165818 (SUSE Security Update for libssh (openSUSE-SU-2013:0130-1)).

Upgrading to version 0.4.7 eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (80220) and Tenable (63125). Entries connected to this vulnerability are available at 63109, 63107, 63105 and 63104.

Productinfo

Name

libssh

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

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

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

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

CVSSv2info

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Local: No
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: 63125
Nessus Name: Debian DSA-2577-1 : libssh - several vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 72627
OpenVAS Name: Debian Security Advisory DSA 2577-1 (libssh)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: libssh 0.4.7

Timelineinfo

08/21/2012 🔍
11/20/2012 +91 days 🔍
11/20/2012 +0 days 🔍
11/30/2012 +10 days 🔍
11/30/2012 +0 days 🔍
12/02/2012 +2 days 🔍
03/24/2015 +842 days 🔍
12/20/2021 +2463 days 🔍

Sourcesinfo

Advisory: Bug 871617
Researcher: Florian Weimer
Organization: Red Hat Product Security Team
Status: Not defined
Confirmation: 🔍

CVE: CVE-2012-4561 (🔍)
OVAL: 🔍

X-Force: 80220
Vulnerability Center: 37473 - Libssh <0.5.3 Multiple Functions Errors Allow Remote DoS\\ Code Execution, Medium
SecurityFocus: 56604 - libssh Multiple Buffer Overflow and Denial of Service Vulnerabilities

See also: 🔍

Entryinfo

Created: 03/24/2015 12:22
Updated: 12/20/2021 15:28
Changes: 03/24/2015 12:22 (68), 04/22/2017 09:13 (7), 12/20/2021 15:28 (3)
Complete: 🔍