Red Hat Enterprise Linux 7 ASN.1 DER Decoder asn1_find_indefinite_length integer overflow

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.
7.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Red Hat Enterprise Linux 7 and classified as critical. The impacted element is the function asn1_find_indefinite_length of the component ASN.1 DER Decoder. Such manipulation leads to integer overflow. This vulnerability is traded as CVE-2016-0758. An attack has to be approached locally. There is no exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Red Hat Enterprise Linux 7 (Operating System). Affected by this issue is the function asn1_find_indefinite_length of the component ASN.1 DER Decoder. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Integer overflow in lib/asn1_decoder.c in the Linux kernel before 4.6 allows local users to gain privileges via crafted ASN.1 data.

The weakness was shared 05/12/2016 by Philip Pettersson with Samsung as 1300257 as confirmed advisory (Website). The advisory is shared for download at access.redhat.com. This vulnerability is handled as CVE-2016-0758 since 12/16/2015. The exploitation is known to be easy. The attack needs to be approached locally. A simple authentication is needed for exploitation. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 91105 (CentOS 7 : kernel (CESA-2016:1033)), 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 157314 (Oracle Enterprise Linux Security Update for kernel (ELSA-2016-2574)-Deprecated).

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (91105) and SecurityFocus (BID 90626†). The entries VDB-82951, VDB-82953, VDB-82963 and VDB-82965 are related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.6

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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

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

NVD Base Score: 🔍

Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 91105
Nessus Name: CentOS 7 : kernel (CESA-2016:1033)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 863389
OpenVAS Name: Ubuntu Update for linux-lts-xenial USN-2979-2
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: 🔍

Patch: git.kernel.org

Timelineinfo

12/16/2015 🔍
05/12/2016 +148 days 🔍
05/12/2016 +0 days 🔍
05/12/2016 +0 days 🔍
05/13/2016 +1 days 🔍
05/28/2016 +15 days 🔍
06/27/2016 +30 days 🔍
08/22/2022 +2247 days 🔍

Sourcesinfo

Vendor: redhat.com

Advisory: 1300257
Researcher: Philip Pettersson
Organization: Samsung
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-0758 (🔍)
GCVE (CVE): GCVE-0-2016-0758
GCVE (VulDB): GCVE-100-87644
SecurityFocus: 90626 - Linux Kernel 'lib/asn1_decoder.c' Local Memory Corruption Vulnerability

See also: 🔍

Entryinfo

Created: 05/29/2016 00:20
Updated: 08/22/2022 11:43
Changes: 05/29/2016 00:20 (68), 12/19/2018 09:15 (15), 08/22/2022 11:43 (3)
Complete: 🔍
Cache ID: 216:F76:103

Once again VulDB remains the best source for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you know our Splunk app?

Download it now for free!