Use of Externally-Controlled Format String Affecting ruby2.5 package, versions <2.5.1-1
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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Use of Externally-Controlled Format String vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-UBUNTU1804-RUBY25-384384
- published3 Apr 2018
- disclosed3 Apr 2018
Introduced: 3 Apr 2018
CVE-2018-8778 (opens in a new tab)How to fix?
Upgrade Ubuntu:18.04 ruby2.5 to version 2.5.1-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream ruby2.5 package and not the ruby2.5 package as distributed by Ubuntu.
See How to fix? for Ubuntu:18.04 relevant fixed versions and status.
In Ruby before 2.2.10, 2.3.x before 2.3.7, 2.4.x before 2.4.4, 2.5.x before 2.5.1, and 2.6.0-preview1, an attacker controlling the unpacking format (similar to format string vulnerabilities) can trigger a buffer under-read in the String#unpack method, resulting in a massive and controlled information disclosure.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2018-8778
- https://www.ruby-lang.org/en/news/2018/03/28/buffer-under-read-unpack-cve-2018-8778/
- https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-2-10-released/
- https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-3-7-released/
- https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-4-4-released/
- https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-5-1-released/
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-8778
- https://www.debian.org/security/2018/dsa-4259
- https://lists.debian.org/debian-lts-announce/2018/04/msg00023.html
- https://lists.debian.org/debian-lts-announce/2018/04/msg00024.html
- https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
- https://security-tracker.debian.org/tracker/CVE-2018-8778
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html
- https://access.redhat.com/errata/RHSA-2018:3729
- https://access.redhat.com/errata/RHSA-2018:3730
- https://access.redhat.com/errata/RHSA-2018:3731
- https://access.redhat.com/errata/RHSA-2019:2028
- http://www.securityfocus.com/bid/103693
- http://www.securitytracker.com/id/1042004
- https://usn.ubuntu.com/3626-1/