Information disclosure in Gnupg Libgcrypt
CVE-2017-9526
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.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.023 (83.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 83.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.023 · newest: 0.023 · change: 0.000
Affected products
Weakness classification (CWE)
References
- www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
- git.gnupg.org/cgi-bin/gitweb.cgi
- www.debian.org/security/2017/dsa-3880 (vendor-advisory)
- www.securityfocus.com/bid/99046 (VDB Entry, Third Party Advisory, vdb-entry)
- git.gnupg.org/cgi-bin/gitweb.cgi
- bugzilla.suse.com/show_bug.cgi (Patch, Issue Tracking)
Frequently asked questions
- What is CVE-2017-9526?
- CVE-2017-9526 is a medium-severity vulnerability in Gnupg Libgcrypt, classified under Information Disclosure. CVSS score: 5.9/10. Published 2017-06-11.
- How severe is CVE-2017-9526?
- Medium severity. CVSS v3 base score is 5.9 out of 10.