GnuTLS 3.4.12 GNUTLS_KEYLOGFILE File input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.8$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in GnuTLS 3.4.12. This issue affects some unknown processing. The manipulation of the argument GNUTLS_KEYLOGFILE as part of Environment Variable results in input validation (File). This vulnerability was named CVE-2016-4456. The attack may be performed from remote. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in GnuTLS 3.4.12 (Network Encryption Software). Affected is some unknown functionality. The manipulation of the argument GNUTLS_KEYLOGFILE as part of a Environment Variable leads to a input validation vulnerability (File). CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on integrity, and availability. CVE summarizes:

The "GNUTLS_KEYLOGFILE" environment variable in gnutls 3.4.12 allows remote attackers to overwrite and corrupt arbitrary files in the filesystem.

The bug was discovered 06/07/2016. The weakness was presented 08/08/2017 (oss-sec). The advisory is shared for download at openwall.com. This vulnerability is traded as CVE-2016-4456 since 05/02/2016. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 11 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 92069 (Fedora 24 : gnutls (2016-266a26df2b)), 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.

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (92069). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.8

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Name: File
Class: Input validation / File
CWE: CWE-20
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: 92069
Nessus Name: Fedora 24 : gnutls (2016-266a26df2b)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for gnutls FEDORA-2016-c61cda2beb
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/02/2016 🔍
06/07/2016 +36 days 🔍
06/18/2016 +11 days 🔍
07/14/2016 +26 days 🔍
08/08/2017 +390 days 🔍
08/08/2017 +0 days 🔍
08/09/2017 +1 days 🔍
12/15/2022 +1954 days 🔍

Sourcesinfo

Advisory: FEDORA-2016-266a26df2b
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-4456 (🔍)
GCVE (CVE): GCVE-0-2016-4456
GCVE (VulDB): GCVE-100-104988

Entryinfo

Created: 08/09/2017 10:38
Updated: 12/15/2022 12:40
Changes: 08/09/2017 10:38 (71), 11/04/2019 17:48 (3), 12/15/2022 12:40 (4)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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