CVE-2017-9526
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 1.7.6-2 |
| debian | bullseye | fixed | 1.7.6-2 |
| debian | forky | fixed | 1.7.6-2 |
| debian | sid | fixed | 1.7.6-2 |
| debian | trixie | fixed | 1.7.6-2 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| gnupg | libgcrypt | {"endIncluding":"1.7.6"} | |
References
- http://www.debian.org/security/2017/dsa-3880
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- http://www.securityfocus.com/bid/99046
- https://bugzilla.suse.com/show_bug.cgi?id=1042326
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=5a22de904a0a366ae79f03ff1e13a1232a89e26b
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=f9494b3f258e01b6af8bd3941ce436bcc00afc56
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
- https://www.suse.com/security/cve/CVE-2017-9526.html
- https://security-tracker.debian.org/tracker/CVE-2017-9526
CWEs
CWE-200
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.