CVE-2017-7526
libgcrypt before version 1.7.8 is vulnerable to a cache side-channel attack resulting into a complete break of RSA-1024 while using the left-to-right method for computing the sliding-window expansion.
Does this matter?
Lower severity and a low EPSS score (3.89%). Track it; it rarely justifies an emergency change on its own.
Description
libgcrypt before version 1.7.8 is vulnerable to a cache side-channel attack resulting into a complete break of RSA-1024 while using the left-to-right method for computing the sliding-window expansion. The same attack is believed to work on RSA-2048 with moderately more computation. This side-channel requires that attacker can run arbitrary software on the hardware where the private RSA key is used.
- CVSS 3.0
- 6.8 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
- EPSS
- 3.89% probability · 90th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-200, CWE-310
- Affected
- gnupg/libgcrypt · canonical/ubuntu linux · debian/debian linux
- Source
- secalert@redhat.com
References
- http://www.securityfocus.com/bid/99338Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038915Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7526Issue Tracking, Patch, Third Party Advisory
- https://eprint.iacr.org/2017/627Third Party Advisory
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=78130828e9a140a9de4dafadbc844dbb64cb709a
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=8725c99ffa41778f382ca97233183bcd687bb0ce
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=e6a3dc9900433bbc8ad362a595a3837318c28fa9
- https://lists.gnupg.org/pipermail/gnupg-announce/2017q2/000408.htmlMailing List, Vendor Advisory
- https://usn.ubuntu.com/3733-1/Third Party Advisory
- https://usn.ubuntu.com/3733-2/Third Party Advisory
- https://www.debian.org/security/2017/dsa-3901Third Party Advisory
- https://www.debian.org/security/2017/dsa-3960Third Party Advisory
- http://www.securityfocus.com/bid/99338Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038915Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7526Issue Tracking, Patch, Third Party Advisory
- https://eprint.iacr.org/2017/627Third Party Advisory
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=78130828e9a140a9de4dafadbc844dbb64cb709a
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=8725c99ffa41778f382ca97233183bcd687bb0ce
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=e6a3dc9900433bbc8ad362a595a3837318c28fa9
- https://lists.gnupg.org/pipermail/gnupg-announce/2017q2/000408.htmlMailing List, Vendor Advisory
- https://usn.ubuntu.com/3733-1/Third Party Advisory
- https://usn.ubuntu.com/3733-2/Third Party Advisory
- https://www.debian.org/security/2017/dsa-3901Third Party Advisory
- https://www.debian.org/security/2017/dsa-3960Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.