Libgcrypt up to 1.7.7 RSA-1024 Sliding-Window Expansion cryptographic issue

HistoryDiffrelatejsonxmlCTI

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.
5.1	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Libgcrypt up to 1.7.7. It has been declared as problematic. The impacted element is an unknown function of the component RSA-1024 Sliding-Window Expansion. The manipulation results in cryptographic issue. This vulnerability was named CVE-2017-7526. The attack needs to be approached locally. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Libgcrypt up to 1.7.7. Affected is some unknown processing of the component RSA-1024 Sliding-Window Expansion. The manipulation with an unknown input leads to a cryptographic issue vulnerability. CWE is classifying the issue as CWE-310. This is going to have an impact on confidentiality.

The bug was discovered 07/06/2017. The weakness was presented 07/29/2017 as confirmed posting (Mailing List). The advisory is shared for download at lists.gnupg.org. This vulnerability is traded as CVE-2017-7526 since 04/05/2017. The exploitability is told to be difficult. The attack needs to be approached locally. Required for exploitation is a authentication. 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 101291 (SUSE SLES11 Security Update : libgcrypt (SUSE-SU-2017:1793-1)), 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 170149 (SUSE Enterprise Linux Security Update for libgcrypt (SUSE-SU-2017:1794-1)). The advisory illustrates:

Note that this side-channel attack requires that the attacker can run arbitrary software on the hardware where the private RSA key is used. Allowing execute access to a box with private keys should be considered as a game over condition, anyway. Thus in practice there are easier ways to access the private keys than to mount this side-channel attack. However, on boxes with virtual machines this attack may be used by one VM to steal private keys from another VM.

Upgrading to version 1.7.8 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 databases at Tenable (101291), SecurityFocus (BID 99338†) and SecurityTracker (ID 1038915†). Further details are available at eprint.iacr.org. 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: 5.1
VulDB Meta Temp Score: 5.1

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

NVD Base Score: 6.8
NVD Vector: 🔍

CNA Base Score: 6.1
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Cryptographic issue
CWE: CWE-310
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
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Nessus ID: 101291
Nessus Name: SUSE SLES11 Security Update : libgcrypt (SUSE-SU-2017:1793-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 53376
OpenVAS Name: Debian Security Advisory DSA 3960-1 (gnupg - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Libgcrypt 1.7.8
Patch: 78130828e9a140a9de4dafadbc844dbb64cb709a

Timelineinfo

04/05/2017 🔍
06/29/2017 +85 days 🔍
07/06/2017 +7 days 🔍
07/06/2017 +0 days 🔍
07/07/2017 +1 days 🔍
07/18/2017 +11 days 🔍
07/29/2017 +11 days 🔍
07/29/2017 +0 days 🔍
07/26/2018 +361 days 🔍
12/14/2022 +1602 days 🔍

Sourcesinfo

Advisory: USN-3733-1
Researcher: Libgcrypt project
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-7526 (🔍)
GCVE (CVE): GCVE-0-2017-7526
GCVE (VulDB): GCVE-100-104628

OVAL: 🔍

SecurityFocus: 99338 - Libgcrypt CVE-2017-7526 Information Disclosure Vulnerability
SecurityTracker: 1038915

Misc.: 🔍

Entryinfo

Created: 07/29/2017 17:43
Updated: 12/14/2022 12:34
Changes: 07/29/2017 17:43 (78), 11/02/2019 10:23 (6), 01/06/2021 16:44 (2), 01/06/2021 16:50 (1), 01/06/2021 16:55 (1), 12/14/2022 12:27 (5), 12/14/2022 12:34 (11)
Complete: 🔍
Cache ID: 216::103