Information Exposure Affecting libgcrypt20 package, versions <1.7.6-2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published11 Jun 2017
- disclosed11 Jun 2017
Introduced: 11 Jun 2017
CVE-2017-9526 (opens in a new tab)How to fix?
Upgrade Debian:unstable libgcrypt20 to version 1.7.6-2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libgcrypt20 package and not the libgcrypt20 package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2017-9526
- https://bugzilla.suse.com/show_bug.cgi?id=1042326
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=5a22de904a0a366ae79f03ff1e13a1232a89e26b
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=f9494b3f258e01b6af8bd3941ce436bcc00afc56
- http://www.debian.org/security/2017/dsa-3880
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- http://www.securityfocus.com/bid/99046
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2017-9526
- 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