| Name | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-3880-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| libgcrypt20 (PTS) | buster | 1.8.4-5+deb10u1 | fixed |
| bullseye | 1.8.7-6 | fixed | |
| bookworm | 1.10.1-3 | fixed | |
| sid, trixie | 1.10.3-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| libgcrypt11 | source | (unstable) | (not affected) | |||
| libgcrypt20 | source | jessie | 1.6.3-2+deb8u3 | DSA-3880-1 | ||
| libgcrypt20 | source | (unstable) | 1.7.6-2 |
- libgcrypt11 <not-affected> (Curve Ed25519 signing and verification introduced in 1.6.0)
master: https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=5a22de904a0a366ae79f03ff1e13a1232a89e26b
1.7.x: https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=f9494b3f258e01b6af8bd3941ce436bcc00afc56
Curve Ed25519 signing and verification inplemented in 1.6.0 with
https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=bc5199a02abe428ad377443280b3eda60141a1d6
and following refactorings.