OpenBSD OpenSSH up to 3.4p1 gss-serv.c ssh_gssapi_parse_ename numeric error

CVSS Meta Temp Score
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CTI Interest Score
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4.3$5k-$25k0.00

A vulnerability was found in OpenBSD OpenSSH up to 3.4p1 (Connectivity Software). It has been classified as problematic. Affected is the function ssh_gssapi_parse_ename of the file gss-serv.c. The manipulation with an unknown input leads to a numeric error vulnerability. CWE is classifying the issue as CWE-189. This is going to have an impact on availability. CVE summarizes:

The ssh_gssapi_parse_ename function in gss-serv.c in OpenSSH 5.8 and earlier, when gssapi-with-mic authentication is enabled, allows remote authenticated users to cause a denial of service (memory consumption) via a large value in a certain length field. NOTE: there may be limited scenarios in which this issue is relevant.

The weakness was presented 04/05/2012 by Adam Zabrocki (Website). The advisory is available at site.pi3.com.pl. This vulnerability is traded as CVE-2011-5000 since 12/24/2011. It is possible to launch the attack remotely. The successful exploitation needs a authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 12/01/2021).

The vulnerability scanner Nessus provides a plugin with the ID 68558 (Oracle Linux 6 : openssh (ELSA-2012-0884)), 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 165457 (SUSE Enterprise Linux Security Update for openssh (SUSE-SU-2012:1045-1)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at X-Force (74809) and Tenable (68558). See 56678 for similar entry.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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Exploitinginfo

Class: Numeric error
CWE: CWE-189
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 68558
Nessus Name: Oracle Linux 6 : openssh (ELSA-2012-0884)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 881183
OpenVAS Name: CentOS Update for openssh CESA-2012:0884 centos6
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/24/2011 🔍
04/05/2012 +103 days 🔍
04/05/2012 +0 days 🔍
04/05/2012 +0 days 🔍
06/20/2012 +76 days 🔍
07/04/2012 +14 days 🔍
07/12/2013 +373 days 🔍
03/23/2015 +619 days 🔍
12/01/2021 +2445 days 🔍

Sourcesinfo

Vendor: openbsd.org

Advisory: RHSA-2012:0884
Researcher: Adam Zabrocki
Status: Not defined

CVE: CVE-2011-5000 (🔍)
OVAL: 🔍

X-Force: 74809
Vulnerability Center: 35474 - OpenSSH 5.8 and Earlier ssh_gssapi_parse_ename () Allows Remote DoS Vulnerability, Low
SecurityFocus: 54114 - OpenSSH 'ssh_gssapi_parse_ename()' Function Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 03/23/2015 16:50
Updated: 12/01/2021 03:51
Changes: 03/23/2015 16:50 (63), 04/14/2017 13:51 (11), 12/01/2021 03:44 (3), 12/01/2021 03:51 (1)
Complete: 🔍

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