CVE-2017-9526
Published: 10 June 2017
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.
Notes
| Author | Note |
|---|---|
| tyhicks | EdDSA support was added in 1.6.0 |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
libgcrypt11 Launchpad, Ubuntu, Debian |
artful |
Does not exist
|
| bionic |
Does not exist
|
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| trusty |
Not vulnerable
(1.5.3-2ubuntu4.4)
|
|
| upstream |
Not vulnerable
|
|
| xenial |
Does not exist
|
|
| yakkety |
Does not exist
|
|
| zesty |
Does not exist
|
|
|
libgcrypt20 Launchpad, Ubuntu, Debian |
artful |
Not vulnerable
(1.7.6-2)
|
| bionic |
Not vulnerable
(1.7.6-2)
|
|
| cosmic |
Not vulnerable
(1.7.6-2)
|
|
| disco |
Not vulnerable
(1.7.6-2)
|
|
| trusty |
Does not exist
(trusty was needed)
|
|
| upstream |
Released
(1.7.6-2)
|
|
| xenial |
Released
(1.6.5-2ubuntu0.3)
|
|
| yakkety |
Released
(1.7.2-2ubuntu1.1)
|
|
| zesty |
Released
(1.7.6-1ubuntu0.1)
|
|
|
Patches: upstream: https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=f9494b3f258e01b6af8bd3941ce436bcc00afc56 upstream: https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=91456759b887e153c4d4ce19538d478df260cab2 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.9 |
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |