GnuTLS up to 3.6.7 Certificate Verification double free

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in GnuTLS up to 3.6.7. This affects an unknown function of the component Certificate Verification. This manipulation causes double free. This vulnerability is tracked as CVE-2019-3829. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in GnuTLS up to 3.6.7 (Network Encryption Software) and classified as critical. Affected by this vulnerability is some unknown functionality of the component Certificate Verification. The manipulation with an unknown input leads to a double free vulnerability. The CWE definition for the vulnerability is CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability was found in gnutls versions from 3.5.8 before 3.6.7. A memory corruption (double free) vulnerability in the certificate verification API. Any client or server application that verifies X.509 certificates with GnuTLS 3.5.8 or later is affected.

The bug was discovered 02/04/2019. The weakness was disclosed 03/27/2019 by Amir as confirmed bug report (Bugzilla). It is possible to read the advisory at bugzilla.redhat.com. This vulnerability is known as CVE-2019-3829 since 01/03/2019. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 51 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277785 (Fedora Security Update for gnutls (FEDORA-2019-e8c1cf958f)).

Upgrading to version 3.5.8 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 105138†). The entries VDB-102981, VDB-123135, VDB-123136 and VDB-123137 are 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: 6.7
VulDB Meta Temp Score: 6.6

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

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 5.3
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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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: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: GnuTLS 3.5.8

Timelineinfo

08/21/2018 🔍
01/03/2019 +135 days 🔍
02/04/2019 +32 days 🔍
03/27/2019 +51 days 🔍
03/28/2019 +1 days 🔍
08/17/2023 +1603 days 🔍

Sourcesinfo

Advisory: RHSA-2019:3600
Researcher: Amir
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2019-3829 (🔍)
GCVE (CVE): GCVE-0-2019-3829
GCVE (VulDB): GCVE-100-132547
SecurityFocus: 105138 - GnuTLS Multiple Information Disclosure Vulnerabilities

See also: 🔍

Entryinfo

Created: 03/28/2019 14:14
Updated: 08/17/2023 11:19
Changes: 03/28/2019 14:14 (63), 05/22/2020 12:58 (5), 08/17/2023 11:12 (4), 08/17/2023 11:19 (12)
Complete: 🔍
Cache ID: 216::103

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

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