SB2020031309 - Gentoo update for Ruby

Description

This security bulletin contains information about 4 secuirty vulnerabilities.

1) Input validation error (CVE-ID: CVE-2019-15845)

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists in Ruby due to insufficient validation of user-supplied files within File.fnmatch and File.fnmatch? functions when processing NUL byte in the filename. A remote attacker can bypass implemented security restrictions and gain unauthorized access to the system.

2) Input validation error (CVE-ID: CVE-2019-16201)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input within the WEBrick::HTTPAuth::DigestAuth in Ruby due to a regular expression issue. A remote attacker can send a specially crafted request to the application and perform a denial of service attack.

3) HTTP Response Splitting (CVE-ID: CVE-2019-16254)

The vulnerability allows a remote attacker to perform HTTP response splitting attack.

The vulnerability exists due to insufficient validation of CRLF sequences within the WEBrick in Ruby. A remote attacker can send a specially crafted request to the application and perform a spoofing attack.

4) Code injection (CVE-ID: CVE-2019-16255)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation in lib/shell.rb in Ruby when processing Shell#[] and its alias Shell#test. A remote attacker can send a specially crafted request and execute arbitrary Ruby code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Remediation

Install update from vendor's website.

References

• https://security.gentoo.org/
• https://security.gentoo.org/glsa/202003-06