SB2020050417 - Multiple vulnerabilities in SaltStack Salt

Description

This security bulletin contains information about 2 vulnerabilities.

1) Improper Authentication (CVE-ID: CVE-2020-11651)

CWE-ID: CWE-287 - Improper Authentication

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to the salt-master process "ClearFuncs" class does not properly validate method calls. A remote non-authenticated attacker can bypass authentication process and gain access some methods without authentication. These methods can be used to retrieve user tokens from the salt master and/or run arbitrary commands on salt minion as root.

Note: this vulnerability is being actively exploited in the wild.

2) Path traversal (CVE-ID: CVE-2020-11652)

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

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:A/U:Green

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in the salt-master process ClearFuncs class. A remote authenticated attacker can send a specially crafted HTTP request and read arbitrary files on the system.

Remediation

Install update from vendor's website.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00047.html
• https://docs.saltstack.com/en/latest/topics/releases/2019.2.4.html
• https://github.com/saltstack/salt/blob/v3000.2_docs/doc/topics/releases/3000.2.rst
• https://labs.f-secure.com/advisories/saltstack-authorization-bypass