OpenSSL up to 0.9.8m Configuration File kssl_keytab_is_available input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability was found in OpenSSL up to 0.9.8m (Network Encryption Software) and classified as problematic. This issue affects the function kssl_keytab_is_available of the component Configuration File. The manipulation with an unknown input leads to a privilege escalation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability. The summary by CVE is:

The kssl_keytab_is_available function in ssl/kssl.c in OpenSSL before 0.9.8n, when Kerberos is enabled but Kerberos configuration files cannot be opened, does not check a certain return value, which allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via SSL cipher negotiation, as demonstrated by a chroot installation of Dovecot or stunnel without Kerberos configuration files inside the chroot.

The issue has been introduced in 07/05/2005. The weakness was shared 03/05/2010 (Website). It is possible to read the advisory at The identification of this vulnerability is CVE-2010-0433. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. 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 1704 days. During that time the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 45359 (OpenSSL < 0.9.8n Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Web Servers. The commercial vulnerability scanner Qualys is able to test this issue with plugin 185029 (HP-UX Running OpenSSL Multiple Vulnerabilities (HPSBUX02517)).

Upgrading to version 0.9.8k eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (57188), Vulnerability Center (SBV-25180) and Tenable (45359). The entries 4377 and 51551 are related to this item.




CPE 2.3info

CPE 2.2info


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

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
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Class: Privilege escalation
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Current Price Estimation: 🔍


Nessus ID: 45359
Nessus Name: OpenSSL < 0.9.8n Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
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OpenVAS ID: 67216
OpenVAS Name: Slackware Advisory SSA:2010-090-01 openssl
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Threat Intelligenceinfo

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Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: OpenSSL 0.9.8k


07/05/2005 🔍
01/27/2010 +1666 days 🔍
03/03/2010 +35 days 🔍
03/05/2010 +2 days 🔍
03/05/2010 +0 days 🔍
03/05/2010 +0 days 🔍
03/26/2010 +21 days 🔍
03/29/2010 +3 days 🔍
03/19/2015 +1816 days 🔍
09/05/2021 +2362 days 🔍



Status: Not defined
Confirmation: 🔍

CVE: CVE-2010-0433 (🔍)

X-Force: 57188
Vulnerability Center: 25180 - OpenSSL &lt;0.9.8n Remote DoS Vulnerability via SSL Cipher Negotiation, Medium
SecurityFocus: 38533 - OpenSSL 'dtls1_retrieve_buffered_fragment()' Remote Denial of Service Vulnerability

See also: 🔍


Created: 03/19/2015 12:22 PM
Updated: 09/05/2021 07:36 AM
Changes: (1) source_nessus_risk
Complete: 🔍


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