GnuTLS libtasn1 4.10 lib/parser_aux.c asn1_find_node memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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7.9$0-$5k0.00

Summaryinfo

A vulnerability was found in GnuTLS libtasn1 4.10. It has been rated as critical. Affected by this issue is the function asn1_find_node in the library lib/parser_aux.c. Performing a manipulation results in memory corruption. This vulnerability is cataloged as CVE-2017-6891. It is possible to initiate the attack remotely. There is no exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability classified as critical has been found in GnuTLS libtasn1 4.10 (Network Encryption Software). This affects the function asn1_find_node in the library lib/parser_aux.c. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Two errors in the "asn1_find_node()" function (lib/parser_aux.c) within GnuTLS libtasn1 version 4.10 can be exploited to cause a stacked-based buffer overflow by tricking a user into processing a specially crafted assignments file via the e.g. asn1Coding utility.

The bug was discovered 05/22/2017. The weakness was shared 05/22/2017 by Jakub Jirasek with Secunia Research as confirmed git commit (GIT Repository). It is possible to read the advisory at git.savannah.gnu.org. This vulnerability is uniquely identified as CVE-2017-6891 since 03/14/2017. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 100360 (Debian DLA-950-1 : libtasn1-3 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 and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 172420 (SUSE Enterprise Linux Security Update for libtasn1 (SUSE-SU-2019:1379-1)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.savannah.gnu.org. A possible mitigation has been published 1 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (100360), SecurityFocus (BID 98641†) and SecurityTracker (ID 1038619†). The entry VDB-123082 is related to this item. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.9

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 100360
Nessus Name: Debian DLA-950-1 : libtasn1-3 security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703861
OpenVAS Name: Debian Security Advisory DSA 3861-1 (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: 🔍

Patch: 5520704d075802df25ce4ffccc010ba1641bd484

Timelineinfo

03/14/2017 🔍
05/22/2017 +69 days 🔍
05/22/2017 +0 days 🔍
05/22/2017 +0 days 🔍
05/22/2017 +0 days 🔍
05/23/2017 +1 days 🔍
05/23/2017 +0 days 🔍
05/24/2017 +1 days 🔍
06/06/2017 +13 days 🔍
12/07/2022 +2010 days 🔍

Sourcesinfo

Advisory: git.savannah.gnu.org
Researcher: Jakub Jirasek
Organization: Secunia Research
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-6891 (🔍)
GCVE (CVE): GCVE-0-2017-6891
GCVE (VulDB): GCVE-100-101619

OVAL: 🔍

SecurityFocus: 98641 - GnuTLS CVE-2017-6891 Stack Buffer Overflow Vulnerability
SecurityTracker: 1038619

See also: 🔍

Entryinfo

Created: 05/23/2017 09:01
Updated: 12/07/2022 07:16
Changes: 05/23/2017 09:01 (83), 10/25/2019 17:30 (7), 12/07/2022 07:16 (4)
Complete: 🔍
Cache ID: 216::103

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