Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gnupg | Libgcrypt | <= 1.7.6 |
Related Weaknesses (CWE)
References
- http://www.debian.org/security/2017/dsa-3880
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- http://www.securityfocus.com/bid/99046Third Party AdvisoryVDB Entry
- https://bugzilla.suse.com/show_bug.cgi?id=1042326Issue TrackingPatch
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=5a22de90
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=f9494b3f
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
- http://www.debian.org/security/2017/dsa-3880
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- http://www.securityfocus.com/bid/99046Third Party AdvisoryVDB Entry
- https://bugzilla.suse.com/show_bug.cgi?id=1042326Issue TrackingPatch
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=5a22de90
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=f9494b3f
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
FAQ
What is CVE-2017-9526?
CVE-2017-9526 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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...
How severe is CVE-2017-9526?
CVE-2017-9526 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2017-9526?
Check the references section above for vendor advisories and patch information. Affected products include: Gnupg Libgcrypt.