gnu gnutls up to 1.0.18 lib/gnutls_kx.c _gnutls_recv_client_kx_message improper authentication

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.
8.8	$0-$5k	0.00

Summaryinfo

A vulnerability marked as problematic has been reported in gnu gnutls up to 1.0.18. This affects the function _gnutls_recv_client_kx_message in the library lib/gnutls_kx.c. The manipulation leads to improper authentication. This vulnerability is listed as CVE-2008-1949. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in gnu gnutls up to 1.0.18 (Network Encryption Software). This issue affects the function _gnutls_recv_client_kx_message in the library lib/gnutls_kx.c. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The _gnutls_recv_client_kx_message function in lib/gnutls_kx.c in libgnutls in gnutls-serv in GnuTLS before 2.2.4 continues to process Client Hello messages within a TLS message after one has already been processed, which allows remote attackers to cause a denial of service (NULL dereference and crash) via a TLS message containing multiple Client Hello messages, aka GNUTLS-SA-2008-1-2.

The bug was discovered 05/19/2008. The weakness was presented 05/21/2008 with Codenomicon as confirmed advisory (CERT.org). The advisory is shared at kb.cert.org. The identification of this vulnerability is CVE-2008-1949 since 04/24/2008. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 43688 (CentOS 5 : gnutls (CESA-2008:0489)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 165699 (SUSE Enterprise Linux Security Update gnutls (SUSE-SA:2008:046)).

Upgrading to version 1.0.19 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (42530), Tenable (43688), SecurityFocus (BID 29292†), OSVDB (45383†) and Secunia (SA30287†). See VDB-42474 and VDB-42472 for similar entries. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Network Encryption Software

Vendor

• gnu

Name

• gnutls

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0.4
• 1.0.5
• 1.0.6
• 1.0.7
• 1.0.8
• 1.0.9
• 1.0.10
• 1.0.11
• 1.0.12
• 1.0.13
• 1.0.14
• 1.0.15
• 1.0.16
• 1.0.17
• 1.0.18

License

• open-source

Website

• Vendor: https://www.gnu.org/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 8.8

VulDB Base Score: 9.8
VulDB Temp Score: 8.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 43688
Nessus Name: CentOS 5 : gnutls (CESA-2008:0489)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 61034
OpenVAS Name: Debian Security Advisory DSA 1581-1 (gnutls13)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: gnutls 1.0.19

Timelineinfo

04/24/2008 🔍
05/19/2008 +25 days 🔍
05/20/2008 +1 days 🔍
05/20/2008 +0 days 🔍
05/21/2008 +1 days 🔍
05/21/2008 +0 days 🔍
05/21/2008 +0 days 🔍
05/21/2008 +0 days 🔍
05/25/2008 +4 days 🔍
01/06/2010 +591 days 🔍
03/16/2015 +1895 days 🔍
12/30/2024 +3577 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: kb.cert.org
Organization: Codenomicon
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2008-1949 (🔍)
GCVE (CVE): GCVE-0-2008-1949
GCVE (VulDB): GCVE-100-42473

OVAL: 🔍

CERT: 🔍
X-Force: 42530
SecurityFocus: 29292 - GnuTLS Prior to 2.2.5 Multiple Remote Vulnerabilities
Secunia: 30287
OSVDB: 45383 - CVE-2008-1949 - GnuTLS - Denial-Of-Service Issue
SecurityTracker: 1020058
Vulnerability Center: 18458 - GNU GnuTLS Allows Remote Attackers to Cause DoS via Multiple Client Hello Messages in a TLS Message, Medium
Vupen: ADV-2008-1582

See also: 🔍

Entryinfo

Created: 03/16/2015 17:00
Updated: 12/30/2024 01:50
Changes: 03/16/2015 17:00 (78), 08/10/2019 16:42 (12), 12/30/2024 01:50 (17)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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