Medium severity · published Jun 11, 2017
CVE-2017-9526
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
5.9
CVSS
2.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.3% · higher than 84% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Libgcrypt · Gnupg
through 1.7.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-9526
CVE.org
https://www.cve.org/CVERecord?id=CVE-2017-9526
www.debian.org
http://www.debian.org/security/2017/dsa-3880
www.oracle.com
http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
Third Party Advisory
http://www.securityfocus.com/bid/99046
Issue Tracking
https://bugzilla.suse.com/show_bug.cgi?id=1042326
git.gnupg.org
https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=5a22de904a0a366ae79f03ff1e13a1232a89e26b
git.gnupg.org
https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=f9494b3f258e01b6af8bd3941ce436bcc00afc56
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