CVE-2017-7526
Published: July 26, 2018Last modified: November 9, 2023
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.8 |
| Attack Vector | NETWORK |
| Attack complexity | HIGH |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | CHANGED |
| Confidentiality | HIGH |
| Integrity impact | NONE |
| Availability impact | NONE |
| Vector | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | gnupg | Not affected (2.2.40-r0) |
| libgcrypt | Not affected (1.10.1-r0) | ||
| Stream | gnupg | Not affected (2.4.3-r1) | |
| libgcrypt | Not affected (1.10.2-r2) |
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%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.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