CVE-2017-9526

MEDIUM

Libgcrypt < 1.7.7 - EdDSA Long-Term Secret Key Exposure via Session Key Leak

Title source: llm
STIX 2.1

Description

In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel observation during the signing process) can easily recover the long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this session key in secure memory, to ensure that constant-time point operations are used in the MPI library.

References (7)

Core 7
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/99046
Issue Tracking, Patch x_refsource_confirm
https://bugzilla.suse.com/show_bug.cgi?id=1042326
Third Party Advisory vendor-advisory x_refsource_debian
http://www.debian.org/security/2017/dsa-3880

Scores

CVSS v3 5.9
EPSS 0.0232
EPSS Percentile 81.4%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

CWE
CWE-200
Status published
Products (1)
gnupg/libgcrypt < 1.7.6
Published Jun 11, 2017
Tracked Since Feb 18, 2026