Ubuntu update for ruby-rack

Published: 2021-04-06

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-8161 CVE-2020-8184
CWE-ID	CWE-22 CWE-353
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Ubuntu Operating systems & Components / Operating system ruby-rack (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Path traversal

EUVDB-ID: #VU67622

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-8161

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

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 Rack::Directory app. A remote attacker can send a specially crafted request and read arbitrary files on the system.

Mitigation

Update the affected package ruby-rack to the latest version.

Vulnerable software versions

Ubuntu: 16.04 - 20.10

ruby-rack (Ubuntu package): before 1.6.4-3ubuntu0.2

CPE2.3

External links

https://ubuntu.com/security/notices/USN-4561-2

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Missing support for integrity check

EUVDB-ID: #VU67621

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-8184

CWE-ID: CWE-353 - Missing Support for Integrity Check