gnu gnutls up to 1.0.18 lib/ext_server_name.c pack_security_parameters numeric error

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.
9.0	$0-$5k	0.00

Summaryinfo

A vulnerability labeled as critical has been found in gnu gnutls up to 1.0.18. Affected by this issue is the function pack_security_parameters in the library lib/ext_server_name.c. Executing a manipulation can lead to numeric error. This vulnerability is tracked as CVE-2008-1948. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in gnu gnutls up to 1.0.18 (Network Encryption Software). This vulnerability affects the function pack_security_parameters in the library lib/ext_server_name.c. The manipulation with an unknown input leads to a numeric error vulnerability. The CWE definition for the vulnerability is CWE-189. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The _gnutls_server_name_recv_params function in lib/ext_server_name.c in libgnutls in gnutls-serv in GnuTLS before 2.2.4 does not properly calculate the number of Server Names in a TLS 1.0 Client Hello message during extension handling, which allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via a zero value for the length of Server Names, which leads to a buffer overflow in session resumption data in the pack_security_parameters function, aka GNUTLS-SA-2008-1-1.

The bug was discovered 05/19/2008. The weakness was disclosed 05/21/2008 with Codenomicon as confirmed advisory (CERT.org). The advisory is shared for download at kb.cert.org. This vulnerability was named CVE-2008-1948 since 04/24/2008. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, 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 1 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 67696 (Oracle Linux 5 : gnutls (ELSA-2008-0489)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 115828 (VLC Media Player GnuTLS and Libxml2 Vulnerabilities).

Upgrading to version 1.0.19 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (42532), Tenable (67696), SecurityFocus (BID 29292†), OSVDB (45382†) and Secunia (SA30287†). The entries VDB-42474 and VDB-42473 are pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

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: 10.0
VulDB Meta Temp Score: 9.0

VulDB Base Score: 10.0
VulDB Temp Score: 9.0
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: Numeric error
CWE: CWE-189
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: 67696
Nessus Name: Oracle Linux 5 : gnutls (ELSA-2008-0489)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

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: 🔍

0-Day Time: 🔍

Upgrade: gnutls 1.0.19

Timelineinfo

04/24/2008 🔍
05/19/2008 +25 days 🔍
05/19/2008 +0 days 🔍
05/20/2008 +1 days 🔍
05/20/2008 +0 days 🔍
05/20/2008 +0 days 🔍
05/21/2008 +1 days 🔍
05/21/2008 +0 days 🔍
05/25/2008 +4 days 🔍
07/12/2013 +1874 days 🔍
03/16/2015 +612 days 🔍
12/30/2024 +3577 days 🔍

Sourcesinfo

Vendor: gnu.org

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

CVE: CVE-2008-1948 (🔍)
GCVE (CVE): GCVE-0-2008-1948
GCVE (VulDB): GCVE-100-42472

OVAL: 🔍

CERT: 🔍
X-Force: 42532
SecurityFocus: 29292 - GnuTLS Prior to 2.2.5 Multiple Remote Vulnerabilities
Secunia: 30287
OSVDB: 45382 - CVE-2008-1948 - GnuTLS - Denial-Of-Service Issue
SecurityTracker: 1020057
Vulnerability Center: 18457 - GNU GnuTLS Allows Remote Attackers to Execute Code and Cause DoS via TLS 1.0 Client Hello Message, High
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 (79), 08/10/2019 16:37 (12), 12/30/2024 01:50 (17)
Complete: 🔍
Cache ID: 216::103

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Discussion

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