OpenSSL up to 1.0.2p/1.1.0i/1.1.1 DSA Signature Timing key management

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5.6	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in OpenSSL up to 1.0.2p/1.1.0i/1.1.1. Affected by this issue is some unknown functionality of the component DSA Signature Handler. This manipulation as part of Timing causes key management. This vulnerability is tracked as CVE-2018-0734. The attack is possible to be carried out remotely. No exploit exists. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability classified as critical was found in OpenSSL up to 1.0.2p/1.1.0i/1.1.1 (Network Encryption Software). Affected by this vulnerability is an unknown functionality of the component DSA Signature Handler. The manipulation as part of a Timing leads to a key management vulnerability. The CWE definition for the vulnerability is CWE-320. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The OpenSSL DSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.1a-dev (Affected 1.1.1). Fixed in OpenSSL 1.1.0j-dev (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.0.2q-dev (Affected 1.0.2-1.0.2p).

The bug was discovered 10/30/2018. The weakness was disclosed 10/29/2018 as confirmed git commit (GIT Repository). It is possible to read the advisory at git.openssl.org. This vulnerability is known as CVE-2018-0734 since 11/29/2017. 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 T1600.001 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 118496 (FreeBSD : OpenSSL -- Multiple vulnerabilities in 1.1 branch (238ae7de-dba2-11e8-b713-b499baebfeaf)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176538 (Debian Security Update for openssl (DSA 4348-1)).

Upgrading to version 1.0.2q-dev, 1.1.0j-dev or 1.1.1a-dev eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.openssl.org. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (118496) and SecurityFocus (BID 105758†). The entries VDB-126017, VDB-126937, VDB-127258 and VDB-127262 are pretty similar. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Network Encryption Software

Name

• OpenSSL

Version

• 1.0.2
• 1.0.2a
• 1.0.2b
• 1.0.2c
• 1.0.2d
• 1.0.2e
• 1.0.2f
• 1.0.2g
• 1.0.2h
• 1.0.2i
• 1.0.2j
• 1.0.2k
• 1.0.2l
• 1.0.2m
• 1.0.2n
• 1.0.2o
• 1.0.2p
• 1.1.0
• 1.1.0a
• 1.1.0b
• 1.1.0c
• 1.1.0d
• 1.1.0e
• 1.1.0f
• 1.1.0g
• 1.1.0h
• 1.1.0i
• 1.1.1

License

• open-source

Website

• Product: https://www.openssl.org/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.6

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

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Key management
CWE: CWE-320
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 118496
Nessus Name: FreeBSD : OpenSSL -- Multiple vulnerabilities in 1.1 branch (238ae7de-dba2-11e8-b713-b499baebfeaf)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Upgrade: OpenSSL 1.0.2q-dev/1.1.0j-dev/1.1.1a-dev
Patch: 43e6a58d4991a451daf4891ff05a48735df871ac

Timelineinfo

11/29/2017 🔍
10/29/2018 +333 days 🔍
10/29/2018 +0 days 🔍
10/30/2018 +0 days 🔍
10/30/2018 +0 days 🔍
10/30/2018 +0 days 🔍
10/30/2018 +0 days 🔍
10/31/2018 +1 days 🔍
06/03/2023 +1676 days 🔍

Sourcesinfo

Product: openssl.org

Advisory: RHSA-2019:2304
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-0734 (🔍)
GCVE (CVE): GCVE-0-2018-0734
GCVE (VulDB): GCVE-100-126127

OVAL: 🔍

SecurityFocus: 105758 - OpenSSL CVE-2018-0734 Side Channel Attack Information Disclosure Vulnerability

See also: 🔍

Entryinfo

Created: 10/31/2018 05:43
Updated: 06/03/2023 14:37
Changes: 10/31/2018 05:43 (77), 04/07/2020 16:48 (5), 06/03/2023 14:37 (5)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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