VDB-119492 · CVE-2018-0495 · RHSA-2018:3221

Libgcrypt up to 1.7.9/1.8.2 ECDSA Signature cipher/ecc-ecdsa.c _gcry_ecc_ecdsa_sign information disclosure

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.5	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Libgcrypt up to 1.7.9/1.8.2. Affected is the function _gcry_ecc_ecdsa_sign of the file cipher/ecc-ecdsa.c of the component ECDSA Signature Handler. Such manipulation leads to information disclosure. This vulnerability is uniquely identified as CVE-2018-0495. Local access is required to approach this attack. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Libgcrypt up to 1.7.9/1.8.2. It has been rated as problematic. Affected by this issue is the function _gcry_ecc_ecdsa_sign of the file cipher/ecc-ecdsa.c of the component ECDSA Signature Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 allows a memory-cache side-channel attack on ECDSA signatures that can be mitigated through the use of blinding during the signing process in the _gcry_ecc_ecdsa_sign function in cipher/ecc-ecdsa.c, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.

The bug was discovered 06/13/2018. The weakness was disclosed 06/13/2018 (Website). The advisory is shared for download at securitytracker.com. This vulnerability is handled as CVE-2018-0495 since 11/27/2017. The exploitation is known to be difficult. The attack needs to be approached locally. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

The vulnerability scanner Nessus provides a plugin with the ID 110521 (FreeBSD : libgcrypt -- side-channel attack vulnerability (9b5162de-6f39-11e8-818e-e8e0b747a45a)), 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 237021 (Red Hat Update for openssl (RHSA-2018:3221)).

Upgrading to version 1.7.10 or 1.8.3 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (110521) and SecurityFocus (BID 107666†). The entries VDB-105828, VDB-110413, VDB-115113 and VDB-116841 are pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Libgcrypt

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.6
VulDB Meta Temp Score: 3.5

VulDB Base Score: 2.5
VulDB Temp Score: 2.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.7
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: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

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: 110521
Nessus Name: FreeBSD : libgcrypt -- side-channel attack vulnerability (9b5162de-6f39-11e8-818e-e8e0b747a45a)
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: 🔍
Exposure Time: 🔍

Upgrade: Libgcrypt 1.7.10/1.8.3
Patch: 9010d1576e278a4274ad3f4aa15776c28f6ba965

Timelineinfo

11/27/2017 🔍
06/13/2018 +197 days 🔍
06/13/2018 +0 days 🔍
06/13/2018 +0 days 🔍
06/13/2018 +0 days 🔍
06/14/2018 +1 days 🔍
06/14/2018 +0 days 🔍
04/01/2019 +291 days 🔍
03/27/2023 +1456 days 🔍

Sourcesinfo

Advisory: RHSA-2018:3221⛔
Status: Confirmed

CVE: CVE-2018-0495 (🔍)
GCVE (CVE): GCVE-0-2018-0495
GCVE (VulDB): GCVE-100-119492

OVAL: 🔍

SecurityFocus: 107666 - Apache HTTP Server CVE-2019-0211 Local Privilege Escalation Vulnerability
SecurityTracker: 1041144

See also: 🔍

Entryinfo

Created: 06/14/2018 08:43
Updated: 03/27/2023 09:38
Changes: 06/14/2018 08:43 (75), 02/19/2020 08:24 (4), 03/27/2023 09:38 (7)
Complete: 🔍
Cache ID: 216::103