GnuTLS up to 3.3.16/3.4.3 DN Handler double free

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.
5.1$0-$5k0.00

Summaryinfo

A vulnerability was found in GnuTLS up to 3.3.16/3.4.3. It has been rated as problematic. This impacts an unknown function of the component DN Handler. Performing a manipulation results in double free. This vulnerability is reported as CVE-2015-6251. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in GnuTLS up to 3.3.16/3.4.3 (Network Encryption Software). This affects an unknown function of the component DN Handler. The manipulation with an unknown input leads to a double free vulnerability. CWE is classifying the issue as CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. This is going to have an impact on availability. The summary by CVE is:

Double free vulnerability in GnuTLS before 3.3.17 and 3.4.x before 3.4.4 allows remote attackers to cause a denial of service via a long DistinguishedName (DN) entry in a certificate.

The weakness was disclosed 08/24/2015 (Website). It is possible to read the advisory at gitlab.com. This vulnerability is uniquely identified as CVE-2015-6251 since 08/17/2015. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 85357 (Debian DSA-3334-1 : gnutls28 - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 168030 (SUSE Enterprise Linux Security update for gnutls (SUSE-SU-2015:1518-1)).

Upgrading to version 3.3.17 or 3.4.4 eliminates this vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 21628.

The vulnerability is also documented in the databases at Tenable (85357), SecurityFocus (BID 76267†) and Vulnerability Center (SBV-52290†). The entry VDB-76998 is pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Double free
CWE: CWE-415 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 85357
Nessus Name: Debian DSA-3334-1 : gnutls28 - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 703334
OpenVAS Name: Debian Security Advisory DSA 3334-1 (gnutls28 - security update)
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 3.3.17/3.4.4
Patch: gitlab.com
TippingPoint: 🔍
Fortigate IPS: 🔍

Timelineinfo

08/10/2015 🔍
08/10/2015 +0 days 🔍
08/17/2015 +7 days 🔍
08/24/2015 +7 days 🔍
08/24/2015 +0 days 🔍
08/25/2015 +1 days 🔍
08/25/2015 +0 days 🔍
06/13/2022 +2484 days 🔍

Sourcesinfo

Advisory: 272854367efc130fbd4f1a51840d80c630214e12
Status: Not defined
Confirmation: 🔍

CVE: CVE-2015-6251 (🔍)
GCVE (CVE): GCVE-0-2015-6251
GCVE (VulDB): GCVE-100-77427

OVAL: 🔍

SecurityFocus: 76267 - GnuTLS 'common.c' Double Free Denial of Service Vulnerability
SecurityTracker: 1033226
Vulnerability Center: 52290 - GnuTLS Remote DoS via a Long Entry in a Certificate, Medium

See also: 🔍

Entryinfo

Created: 08/25/2015 10:06
Updated: 06/13/2022 12:21
Changes: 08/25/2015 10:06 (60), 11/03/2017 07:52 (13), 06/13/2022 12:14 (5), 06/13/2022 12:21 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you need the next level of professionalism?

Upgrade your account now!