OpenSSL up to 0.9.8c SSLv2 Client null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in OpenSSL. This vulnerability affects unknown code of the component SSLv2 Client. Performing a manipulation results in null pointer dereference. This vulnerability is reported as CVE-2006-4343. Moreover, an exploit is present. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in OpenSSL (Network Encryption Software). This affects an unknown functionality of the component SSLv2 Client. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. The summary by CVE is:

The get_server_hello function in the SSLv2 client code in OpenSSL 0.9.7 before 0.9.7l, 0.9.8 before 0.9.8d, and earlier versions allows remote servers to cause a denial of service (client crash) via unknown vectors that trigger a null pointer dereference.

The bug was discovered 09/28/2006. The weakness was disclosed 09/28/2006 by Tavis Ormandy and Will Drewry with Google Security Team (Website). The advisory is shared at openssl.org. This vulnerability is uniquely identified as CVE-2006-4343 since 08/24/2006. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are unknown but a public exploit is available.

The exploit is shared for download at exploit-db.com. It is declared as functional. The vulnerability was handled as a non-public zero-day exploit for at least 1367 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 45039 (OpenSSL < 0.9.8m Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Web Servers and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 185030 (HP-UX Running OpenSSL Multiple Vulnerabilities (HPSBUX02174)).

Upgrading to version 0.9.7l eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at openssl.org. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published 4 years after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 5077.

The vulnerability is also documented in the databases at X-Force (29240), Exploit-DB (4773), Tenable (45039), SecurityFocus (BID 20246†) and OSVDB (29263†). Further details are available at news.com.com. The entries VDB-1786, VDB-1803, VDB-1858 and VDB-1857 are pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Name

Version

License

Support

  • end of life (old version)

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.5
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Functional
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 45039
Nessus Name: OpenSSL < 0.9.8m Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 57478
OpenVAS Name: Debian Security Advisory DSA 1185-1 (openssl)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: OpenSSL 0.9.7l
Patch: openssl.org
TippingPoint: 🔍
SourceFire IPS: 🔍

Timelineinfo

12/31/2002 🔍
08/24/2006 +1332 days 🔍
09/28/2006 +35 days 🔍
09/28/2006 +0 days 🔍
09/28/2006 +0 days 🔍
09/28/2006 +0 days 🔍
09/28/2006 +0 days 🔍
09/28/2006 +0 days 🔍
09/29/2006 +0 days 🔍
09/29/2006 +0 days 🔍
10/03/2006 +4 days 🔍
05/29/2007 +238 days 🔍
02/25/2010 +1003 days 🔍
03/11/2010 +14 days 🔍
01/13/2025 +5422 days 🔍

Sourcesinfo

Product: openssl.org

Advisory: openssl.org
Researcher: Tavis Ormandy, Will Drewry
Organization: Google Security Team
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2006-4343 (🔍)
GCVE (CVE): GCVE-0-2006-4343
GCVE (VulDB): GCVE-100-2577

OVAL: 🔍

CERT: 🔍
X-Force: 29240 - OpenSSL SSLv2 client get_server_hello() denial of service, Medium Risk
SecurityFocus: 20246 - OpenSSL SSLv2 Null Pointer Dereference Client Denial of Service Vulnerability
Secunia: 25420 - Ingate Firewall and SIParator Multiple Vulnerabilities, Highly Critical
OSVDB: 29263 - OpenSSL SSLv2 get_server_hello Function Remote DoS
SecurityTracker: 1016943
Vulnerability Center: 12816 - [cisco-sr-20061108-openssl] OpenSSL SSLv2 Client Code Allows Remote Servers to Cause Client DoS, High
Vupen: ADV-2007-1973

scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔍
See also: 🔍

Entryinfo

Created: 09/29/2006 10:44
Updated: 01/13/2025 15:25
Changes: 09/29/2006 10:44 (110), 07/08/2019 22:33 (4), 10/13/2024 06:22 (17), 01/13/2025 15:25 (1)
Complete: 🔍
Cache ID: 216:ACF:103

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