CVE-2017-7526 Information

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 Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Reference

http://www.securityfocus.com/bid/99338 http://www.securitytracker.com/id/1038915 https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7526 https://eprint.iacr.org/2017/627 https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=78130828e9a140a9de4dafadbc844dbb64cb709a https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=8725c99ffa41778f382ca97233183bcd687bb0ce https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=e6a3dc9900433bbc8ad362a595a3837318c28fa9 https://lists.gnupg.org/pipermail/gnupg-announce/2017q2/000408.html https://usn.ubuntu.com/3733-1/ https://usn.ubuntu.com/3733-2/ https://www.debian.org/security/2017/dsa-3901 https://www.debian.org/security/2017/dsa-3960

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

6.8