Bug 1459887 (CVE-2017-9526) - CVE-2017-9526 libgcrypt: Possible timing attack on EdDSA session key
Summary: CVE-2017-9526 libgcrypt: Possible timing attack on EdDSA session key
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2017-9526
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1459888 1459889 1459890
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-06-08 13:04 UTC by Adam Mariš
Modified: 2021-02-17 02:02 UTC (History)
14 users (show)

Fixed In Version: libgcrypt 1.7.7
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Clone Of:
Environment:
Last Closed: 2019-06-08 03:14:55 UTC
Embargoed:

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Description Adam Mariš 2017-06-08 13:04:25 UTC 
An attacker who learns the EdDSA session key from side-channel observation during the signing process, can easily recover the long-term secret key. Storing the session key in secure memory ensures that constant time point operations are used in the MPI library.

Upstream fixes:

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
Comment 1 Adam Mariš 2017-06-08 13:05:18 UTC 
Created libgcrypt tracking bugs for this issue:

Affects: fedora-all [bug 1459890]


Created mingw-libgcrypt tracking bugs for this issue:

Affects: epel-7 [bug 1459888]
Affects: fedora-all [bug 1459889]
Comment 2 Adam Mariš 2017-06-08 13:08:01 UTC 
Statement:

This issue did not affect the versions of libgcrypt as shipped with Red Hat Enterprise Linux 5, 6 and 7 as they did not include support for EdDSA cipher.
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