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CVE-2016-10194: Festivaltts4r Project: Command injection

CVE-2016-10194 is rated critical with a CVSS v3.0 base score of 9.8 and affects Festivaltts4r Project. Per its scoring, it can be exploited over the network, without authentication, without any user interaction. The scored impact on confidentiality, integrity and availability is the highest available.

Vulnerability description

The festivaltts4r gem for Ruby allows remote attackers to execute arbitrary commands via shell metacharacters in a string to the (1) to_speech or (2) to_mp3 method in lib/festivaltts4r/festival4r.rb.

Severity breakdown

CVSS v3.0 9.8: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

• Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
• Attack complexity: Low. No special conditions; the attack can be repeated reliably.
• Privileges required: None. No account or prior access is needed.
• User interaction: None. No action from any user is needed.
• Scope: Unchanged. Impact stays within the vulnerable component.
• Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
• Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
• Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-77: Improper Neutralization of Special Elements used in a Command

The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

Affected products

• Festivaltts4r Project: all versions listed by NVD

References

• http://www.openwall.com/lists/oss-security/2017/01/31/14
• http://www.openwall.com/lists/oss-security/2017/02/02/5
• https://github.com/spejman/festivaltts4r/issues/1