Directory Traversal Affecting ruby2.3 package, versions <2.3.1-2~16.04.12
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-RUBY23-341827
- published27 Mar 2019
- disclosed6 Jun 2019
Introduced: 27 Mar 2019
CVE-2019-8320 (opens in a new tab)How to fix?
Upgrade Ubuntu:16.04 ruby2.3 to version 2.3.1-2~16.04.12 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream ruby2.3 package and not the ruby2.3 package as distributed by Ubuntu.
See How to fix? for Ubuntu:16.04 relevant fixed versions and status.
A Directory Traversal issue was discovered in RubyGems 2.7.6 and later through 3.0.2. Before making new directories or touching files (which now include path-checking code for symlinks), it would delete the target destination. If that destination was hidden behind a symlink, a malicious gem could delete arbitrary files on the user's machine, presuming the attacker could guess at paths. Given how frequently gem is run as sudo, and how predictable paths are on modern systems (/tmp, /usr, etc.), this could likely lead to data loss or an unusable system.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2019-8320
- https://blog.rubygems.org/2019/03/05/security-advisories-2019-03.html
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8320
- https://security-tracker.debian.org/tracker/CVE-2019-8320
- https://hackerone.com/reports/317321
- https://lists.debian.org/debian-lts-announce/2020/08/msg00027.html
- https://access.redhat.com/errata/RHSA-2019:1429
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html