SB2018041614 - Ubuntu update for ruby1.9.1, ruby2.0, ruby2.3

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Main Vulnerability Database SB2018041614

SB2018041614 - Ubuntu update for ruby1.9.1, ruby2.0, ruby2.3

Published: April 16, 2018 Updated: October 30, 2026

Security Bulletin ID SB2018041614
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Path traversal (CVE-ID: CVE-2018-6914)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to write arbitrary files on the target system.

The weakness exists in the Dir.mktmpdir method in the tmpdir library due to path traversal. A remote attacker can create a directory or a file at any directory in the prefix argument.

2) Buffer under-read (CVE-ID: CVE-2018-8778)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to obtain potentially sensitive information on the target system.

The weakness exists in the String#unpack method due to buffer under-read. A remote attacker can gain access to potentially sensitive information.

3) Poison null byte (CVE-ID: CVE-2018-8779)

CWE-ID: CWE-626 - Null Byte Interaction Error (Poison Null Byte)

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to write arbitrary files on the target system.

The weakness exists in the UNIXServer.open and UNIXSocket.open methods due to improper checking of null characters. A remote attacker can accept the socket file in the unintentional path.

4) Path traversal (CVE-ID: CVE-2018-8780)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to obtain potentially sensitive information and write arbitrary files on the target system.

The weakness exists in the Dir.open, Dir.new, Dir.entries and Dir.empty? methods due to improper checking of NULL characters. A remote attacker can trigger the unintentional directory traversal.

Remediation

Install update from vendor's website.

References