Cryptographic Issues Affecting gnupg package, versions <1.4.20-1ubuntu3.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1604-GNUPG-340541
- published27 Jun 2018
- disclosed26 Jul 2018
Introduced: 27 Jun 2018
CVE-2017-7526 (opens in a new tab)How to fix?
Upgrade Ubuntu:16.04 gnupg to version 1.4.20-1ubuntu3.3 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream gnupg package and not the gnupg package as distributed by Ubuntu.
See How to fix? for Ubuntu:16.04 relevant fixed versions and status.
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.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2017-7526
- 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://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7526
- https://www.debian.org/security/2017/dsa-3901
- https://www.debian.org/security/2017/dsa-3960
- https://security-tracker.debian.org/tracker/CVE-2017-7526
- https://eprint.iacr.org/2017/627
- https://lists.gnupg.org/pipermail/gnupg-announce/2017q2/000408.html
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7526
- http://www.securityfocus.com/bid/99338
- http://www.securitytracker.com/id/1038915
- https://usn.ubuntu.com/3733-1/
- https://usn.ubuntu.com/3733-2/
- 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