SB2017111201 - Debian update for ruby2.3
Published: November 12, 2017
Security Bulletin ID
SB2017111201
Severity
High
Patch available
YES
Number of vulnerabilities
4
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Improper input validation (CVE-ID: CVE-2017-0898)
The vulnerability allows a remote attacker to cause DoS condition or obtain potentially sensitive information on the target system.The weakness exists due to buffer underrun in the Kernel.sprintf() method. A remote attacker can provide a specially crafted format string value to cause the target interpreter to crash or potentially access data from the heap.
Successful exploitation of the vulnerability results in information disclosure or denial of service.
2) Deserialization of untrusted data (CVE-ID: CVE-2017-0903)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.The weakness exists due to YAML deserialization of gem specifications. A remote attacker can inject an instance of specially crafted serialized objects, gain elevated privileges and execute arbitrary Ruby code on RubyGems.org.
Successful exploitation of the vulnerability may result in system compromise.
3) Information disclosure (CVE-ID: CVE-2017-10784)
The vulnerability allows a remote attacker to cause DoS condition or obtain potentially sensitive information on the target system.The weakness exists due to escape sequence injection vulnerability in the Basic authentication of WEBrick. A remote attacker can supply a specially crafted user name value to the WEBrick Basic authentication function, inject escape sequence into the log file and view log contents.
Successful exploitation of the vulnerability results in information disclosure or denial of service.
4) Improper input validation (CVE-ID: CVE-2017-14033)
The vulnerability allows a remote attacker to cause DoS condition on the target system.The weakness exists due to buffer underrun. A remote attacker can provide a specially crafted string to the OpenSSL::ASN1 decode function to cause the target interpreter to crash.
Successful exploitation of the vulnerability results in denial of service.
Remediation
Install update from vendor's website.
References
- https://www.ruby-lang.org/en/news/2017/09/14/sprintf-buffer-underrun-cve-2017-0898/
- http://blog.rubygems.org/2017/10/09/unsafe-object-deserialization-vulnerability.html
- https://www.ruby-lang.org/en/news/2017/09/14/webrick-basic-auth-escape-sequence-injection-cve-2017-1...
- https://www.ruby-lang.org/en/news/2017/09/14/openssl-asn1-buffer-underrun-cve-2017-14033/