Path traversal in Ruby - CVE-2021-28966
Published: April 8, 2021
Vulnerability identifier: #VU52001
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-28966
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform directory traversal attacks.
The vulnerability exists due to input validation error when processing directory traversal sequences in tmpdir library. A remote attacker can send a specially crafted HTTP request and read arbitrary files on the system.
Affected software
Ruby
ruby (Alpine package)
ruby (Alpine package)
How to mitigate CVE-2021-28966
Install updates from vendor's website.
Ruby - addressed in versions 2.7.3, 3.0.1
ruby (Alpine package) - update to 2.7.3-r0
ruby (Alpine package) - update to 2.7.3-r0