SB2018021520 - Multiple vulnerabilities in RubyGems
Published: February 15, 2018 Updated: April 10, 2018
Security Bulletin ID
SB2018021520
Severity
Low
Patch available
YES
Number of vulnerabilities
3
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 secuirty vulnerabilities.
1) Path traversal (CVE-ID: CVE-2018-1000079)
The vulnerability allows a remote attacker to modify file locations on the target system.The weakness exists due to the improper handling of pathnames when the affected software installs new components. A remote attacker can persuade the victim into install a malicious RubyGems gem and use directory traversal techniques to write to arbitrary file locations.
2) Improper input validation (CVE-ID: CVE-2018-1000077)
The vulnerability allows a remote unauthenticated attacker to write arbitrary files on the target system.
The weakness exists due to improper URL validation of the specification homepage attribute. A remote attacker can trick the victim into installing a malicious RubyGems gem and set an invalid homepage URL.
3) Path traversal (CVE-ID: CVE-2018-1000073)
The vulnerability allows a remote attacker to obtain potentially sensitive information on the target system.The weakness exists in the install_location function of package.rb due to path traversal when writing to a symlinked basedir outside of the root. A remote attacker can gain access to potentially sensitive information.
Remediation
Install update from vendor's website.