GnuTLS PKCS #1 Bleichenbacher cryptographic issue

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in GnuTLS. This impacts an unknown function of the component PKCS #1 Handler. This manipulation causes cryptographic issue (Bleichenbacher). This vulnerability is handled as CVE-2018-16868. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in GnuTLS (Network Encryption Software) (the affected version is unknown). It has been declared as critical. Affected by this vulnerability is an unknown code of the component PKCS #1 Handler. The manipulation with an unknown input leads to a cryptographic issue vulnerability (Bleichenbacher). The CWE definition for the vulnerability is CWE-310. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A Bleichenbacher type side-channel based padding oracle attack was found in the way gnutls handles verification of RSA decrypted PKCS#1 v1.5 data. An attacker who is able to run process on the same physical core as the victim process, could use this to extract plaintext or in some cases downgrade any TLS connections to a vulnerable server.

The bug was discovered 12/03/2018. The weakness was released 12/03/2018 as confirmed bug report (Bugzilla). It is possible to read the advisory at bugzilla.redhat.com. This vulnerability is known as CVE-2018-16868 since 09/11/2018. The exploitation appears to be difficult. 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 attack technique deployed by this issue is T1600 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 119447 (Slackware 14.2 / current : gnutls (SSA:2018-339-01)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Slackware Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 172372 (OpenSUSE Security Update for gnutls (openSUSE-SU-2019:1353-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 3 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (119447) and SecurityFocus (BID 106080†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.6
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: Bleichenbacher
Class: Cryptographic issue / Bleichenbacher
CWE: CWE-310
CAPEC: 🔍
ATT&CK: 🔍

Physical: Yes
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 119447
Nessus Name: Slackware 14.2 / current : gnutls (SSA:2018-339-01)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Timelineinfo

09/11/2018 🔍
11/30/2018 +80 days 🔍
12/03/2018 +3 days 🔍
12/03/2018 +0 days 🔍
12/03/2018 +0 days 🔍
12/04/2018 +1 days 🔍
12/06/2018 +2 days 🔍
12/06/2018 +0 days 🔍
04/16/2020 +497 days 🔍

Sourcesinfo

Advisory: bugzilla.redhat.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-16868 (🔍)
GCVE (CVE): GCVE-0-2018-16868
GCVE (VulDB): GCVE-100-127411
SecurityFocus: 106080 - GNU GnuTLS CVE-2018-16868 Information Disclosure Vulnerability

Entryinfo

Created: 12/04/2018 07:58
Updated: 04/16/2020 21:18
Changes: 12/04/2018 07:58 (73), 04/16/2020 21:18 (6)
Complete: 🔍
Cache ID: 216::103

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

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