GnuPG up to 1.4.13/2.0.x L3 Cache information disclosure

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability has been found in GnuPG up to 1.4.13/2.0.x and classified as critical. Affected by this issue is some unknown functionality of the component L3 Cache. Performing a manipulation results in information disclosure. This vulnerability is reported as CVE-2013-4242. The attack requires a local approach. Moreover, an exploit is present. This vulnerability is considered historic because of its background and reception. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical has been found in GnuPG up to 1.4.13/2.0.x. This affects an unknown part of the component L3 Cache. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality, and integrity. The summary by CVE is:

GnuPG before 1.4.14, and Libgcrypt before 1.5.3 as used in GnuPG 2.0.x and possibly other products, allows local users to obtain private RSA keys via a cache side-channel attack involving the L3 cache, aka Flush+Reload.

The bug was discovered 07/18/2013. The weakness was disclosed 07/25/2013 by Yuval Yarom and Katarina Falkner with University of Adelaide as not defined article (Website). It is possible to read the advisory at eprint.iacr.org. This vulnerability is uniquely identified as CVE-2013-4242 since 06/12/2013. The exploitability is told to be difficult. Attacking locally is a requirement. A authentication is necessary for exploitation. Technical details are unknown but a public exploit is available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/26/2025). The attack technique deployed by this issue is T1592 according to MITRE ATT&CK. Due to its background and reception, this vulnerability has a historic impact.

It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 7 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 70600 (RHEL 5 / 6 : libgcrypt (RHSA-2013:1457)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Red Hat Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 122006 (Solaris 11.1 Support Repository Update (SRU) 18.5.0 Missing).

Upgrading to version 1.4.14 eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (86141), Tenable (70600), SecurityFocus (BID 61464†), OSVDB (95657†) and Secunia (SA54318†). The entries VDB-7237, VDB-7238, VDB-34383 and VDB-61154 are pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.1
VulDB Meta Temp Score: 6.4

VulDB Base Score: 7.1
VulDB Temp Score: 6.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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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: 🔍
Access: Public
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 70600
Nessus Name: RHEL 5 / 6 : libgcrypt (RHSA-2013:1457)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 892730
OpenVAS Name: Debian Security Advisory DSA 2730-1 (gnupg - information leak
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: GnuPG 1.4.14

Timelineinfo

06/12/2013 🔍
07/18/2013 +36 days 🔍
07/25/2013 +7 days 🔍
07/25/2013 +0 days 🔍
07/25/2013 +0 days 🔍
07/29/2013 +4 days 🔍
08/02/2013 +4 days 🔍
08/07/2013 +5 days 🔍
08/19/2013 +12 days 🔍
10/25/2013 +67 days 🔍
01/26/2025 +4111 days 🔍

Sourcesinfo

Advisory: eprint.iacr.org
Researcher: Yuval Yarom, Katarina Falkner
Organization: University of Adelaide
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2013-4242 (🔍)
GCVE (CVE): GCVE-0-2013-4242
GCVE (VulDB): GCVE-100-9747

OVAL: 🔍
IAVM: 🔍

CERT: 🔍
X-Force: 86141
SecurityFocus: 61464 - libgcrypt RSA Secret Keys Information Disclosure Vulnerability
Secunia: 54318 - Ubuntu update for gnupg and libgcrypt11, Not Critical
OSVDB: 95657
Vulnerability Center: 40903 - GnuPG before 1.4.14 and Libgcrypt before 1.5.3 Local Private Key Disclosure Vulnerability via Side-Channel Attack, Low

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 07/29/2013 13:14
Updated: 01/26/2025 19:52
Changes: 07/29/2013 13:14 (85), 08/09/2019 15:35 (5), 05/20/2021 15:06 (3), 01/26/2025 19:52 (17)
Complete: 🔍
Committer: olku
Cache ID: 216:C4B:103

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

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