Nettle 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 described as critical has been identified in Nettle. Affected is an unknown function of the component PKCS #1 Handler. Such manipulation leads to cryptographic issue (Bleichenbacher). This vulnerability is uniquely identified as CVE-2018-16869. The attack can be launched remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Nettle (unknown version). It has been rated as critical. Affected by this issue is an unknown code block of the component PKCS #1 Handler. The manipulation with an unknown input leads to a cryptographic issue vulnerability (Bleichenbacher). Using CWE to declare the problem leads to CWE-310. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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

The bug was discovered 12/03/2018. The weakness was disclosed 12/03/2018 as not defined bug report (Bugzilla). The advisory is shared for download at bugzilla.redhat.com. This vulnerability is handled as CVE-2018-16869 since 09/11/2018. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1600.

The vulnerability scanner Nessus provides a plugin with the ID 120192 (SUSE SLED15 / SLES15 Security Update : libnettle (SUSE-SU-2018:4193-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371626 (F5 BIG-IP ASM,LTM,APM Nettle Information Disclosure Vulnerabilitiy (K45616155)).

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

The vulnerability is also documented in the databases at Tenable (120192) and SecurityFocus (BID 106092†). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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

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

NVD Base Score: 5.7
NVD Vector: 🔍

CVSSv2info

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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: 120192
Nessus Name: SUSE SLED15 / SLES15 Security Update : libnettle (SUSE-SU-2018:4193-1)
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 🔍
12/19/2018 +15 days 🔍
01/02/2019 +14 days 🔍
04/16/2020 +470 days 🔍

Sourcesinfo

Advisory: bugzilla.redhat.com
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-16869 (🔍)
GCVE (CVE): GCVE-0-2018-16869
GCVE (VulDB): GCVE-100-127412
SecurityFocus: 106092 - GNU Nettle CVE-2018-16869 Information Disclosure Vulnerability

Entryinfo

Created: 12/04/2018 07:59
Updated: 04/16/2020 21:27
Changes: 12/04/2018 07:59 (72), 04/16/2020 21:27 (6)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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