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CVE-2016-9639: Saltstack: Improper Access Control

CVE-2016-9639 is rated critical with a CVSS v3.0 base score of 9.1 and affects Saltstack. Per its scoring, it can be exploited over the network, without authentication, without any user interaction.

Vulnerability description

Salt before 2015.8.11 allows deleted minions to read or write to minions with the same id, related to caching.

Severity breakdown

CVSS v3.0 9.1: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

• 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: None. No effect on availability.

Underlying weakness

CWE-284: Improper Access Control

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Affected products

• Saltstack: up to and including 2015.8.10

References

• https://docs.saltstack.com/en/2015.8/ref/configuration/master.html#rotate-aes-key
• http://www.openwall.com/lists/oss-security/2016/11/25/2
• http://www.openwall.com/lists/oss-security/2016/11/25/3
• http://www.securityfocus.com/bid/94553