Vulnerability CVE-2017-7526
Published: 2018-07-26

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.

Type:

CWE-310

 (Cryptographic Issues)

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Gnupg -> Libgcrypt 
Debian -> Debian linux 
Canonical -> Ubuntu linux 

 References:
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
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