CVE-2019-8320
A Directory Traversal issue was discovered in RubyGems 2.7.6 and later through 3.0.2.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.21%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.0
- 7.4 HIGHCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
- EPSS
- 4.21% probability · 90th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-22
- Affected
- rubygems/rubygems
- Source
- cve@mitre.org
References
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html
- https://access.redhat.com/errata/RHSA-2019:1429
- https://blog.rubygems.org/2019/03/05/security-advisories-2019-03.htmlVendor Advisory
- https://hackerone.com/reports/317321Exploit, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/08/msg00027.html
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html
- https://access.redhat.com/errata/RHSA-2019:1429
- https://blog.rubygems.org/2019/03/05/security-advisories-2019-03.htmlVendor Advisory
- https://hackerone.com/reports/317321Exploit, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/08/msg00027.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.