GNU Libtasn1 up to 4.12 BER Decoder decoding.c asn1_decode_simple_ber resource management

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.
6.3$0-$5k0.00

Summaryinfo

A vulnerability has been found in GNU Libtasn1 up to 4.12 and classified as problematic. This impacts the function asn1_decode_simple_ber of the file decoding.c of the component BER Decoder. This manipulation causes resource management. This vulnerability is tracked as CVE-2018-6003. The attack is possible to be carried out remotely. No exploit exists. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability has been found in GNU Libtasn1 up to 4.12 and classified as problematic. Affected by this vulnerability is the function asn1_decode_simple_ber of the file decoding.c of the component BER Decoder. The manipulation with an unknown input leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect availability. The summary by CVE is:

An issue was discovered in the _asn1_decode_simple_ber function in decoding.c in GNU Libtasn1 before 4.13. Unlimited recursion in the BER decoder leads to stack exhaustion and DoS.

The bug was discovered 01/22/2018. The weakness was disclosed 01/22/2018 as confirmed git commit (GIT Repository). The advisory is shared at git.savannah.nongnu.org. This vulnerability is known as CVE-2018-6003 since 01/22/2018. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 106423 (Fedora 27 : mingw-libtasn1 (2018-f8c54aeec4)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197033 (Ubuntu Security Notification for Libtasn1-6 Vulnerabilities (USN-3547-1)).

Upgrading to version 4.13 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.savannah.nongnu.org. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published 6 days after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (106423). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

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

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

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

NVD Base Score: 🔍

Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
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: 106423
Nessus Name: Fedora 27 : mingw-libtasn1 (2018-f8c54aeec4)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 56275
OpenVAS Name: Debian Security Advisory DSA 4106-1 (libtasn1-6 - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Upgrade: Libtasn1 4.13
Patch: git.savannah.nongnu.org

Timelineinfo

01/22/2018 🔍
01/22/2018 +0 days 🔍
01/22/2018 +0 days 🔍
01/22/2018 +0 days 🔍
01/23/2018 +1 days 🔍
01/28/2018 +5 days 🔍
01/29/2018 +1 days 🔍
02/02/2023 +1830 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: FEDORA-2018-f8c54aeec4
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-6003 (🔍)
GCVE (CVE): GCVE-0-2018-6003
GCVE (VulDB): GCVE-100-112297

OVAL: 🔍

Entryinfo

Created: 01/23/2018 08:02
Updated: 02/02/2023 12:16
Changes: 01/23/2018 08:02 (77), 12/26/2019 16:12 (3), 02/02/2023 12:09 (4), 02/02/2023 12:16 (1)
Complete: 🔍
Cache ID: 216::103

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

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to know what is going to be exploited?

We predict KEV entries!