SB2021032525 - Ubuntu update for ruby2.0

Description

This security bulletin contains information about 9 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) 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.

3) 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.

4) 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.

5) 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.

6) 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.

7) HTTP response splitting (CVE-ID: CVE-2017-17742)

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

The weakness exists due to improper handling of HTTP requests. If a script accepts an external input and outputs it without modification as a part of HTTP responses, a remote attacker can use newline characters to trick the victim that the HTTP response header is stopped at there and inject fake HTTP responses after the newline characters to show malicious contents to the victim.

8) Desereliazation of untrusted data (CVE-ID: CVE-2018-1000074)

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

The weakness exists in owner command due to desereliazation of untrusted data. A remote attacker can execute arbitrary code.

Successful exploitation of the vulnerability may result in system compromise.

9) Resource exhaustion (CVE-ID: CVE-2018-8777)

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists a large request in WEBrick. A remote attacker can send a large HTTP request with a crafted header to WEBrick server or a crafted body to WEBrick server/handler and cause the service to crash.

Remediation

Install update from vendor's website.

References

• https://ubuntu.com/security/notices/USN-3685-2