SB2017121902 - Red Hat update for ruby
Published: December 19, 2017
Security Bulletin ID
SB2017121902
Severity
Low
Patch available
YES
Number of vulnerabilities
8
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 8 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) Security restrictions bypass (CVE-ID: CVE-2017-0899)
The vulnerability allows a remote attacker to bypass security restrictions on the target system.The weakness exists due to unknown error. A remote attacker can escape ANSI.
3) Denial of service (CVE-ID: CVE-2017-0900)
The vulnerability allows a local attacker to cause DoS condition on the target system.The weakness exists due to insufficient validation of user-supplied input. A local attacker can supply a specially crafted 'query' command and cause the service to crash.
Successful exploitation of the vulnerability results in denial of service.
4) Improper input validation (CVE-ID: CVE-2017-0901)
The vulnerability allows a remote attacker to overwrite arbitrary files on the target system.The weakness exists due to insufficient validation of user-supplied input. A remote attacker can trick the victim into installing a specially crafted RubyGem and overwrite arbitrary files.
5) Session hijacking (CVE-ID: CVE-2017-0902)
The vulnerability allows a remote attacker to hijack the target user's session.The weakness exists due to improper access control. A remote attacker can hijack DNS sessions.
6) 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.
7) 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.
8) Information disclosure (CVE-ID: CVE-2017-14064)
The vulnerability allows a remote attacker to obtain potentially sensitive information on the target system.The weakness exists due to an issue with using strdup in ext/json/ext/generator/generator.c during a JSON generate call. A remote attacker can send a specially crafted request, stop strdup after encountering a '' byte, returning a pointer to a string of length zero, which is not the length stored in space_len and expose arbitrary memory.
Successful exploitation of the vulnerability results in information disclosure.
Remediation
Install update from vendor's website.