SB2020081318 - Ubuntu update for salt

Description

This security bulletin contains information about 5 secuirty vulnerabilities.

1) Path traversal (CVE-ID: CVE-2018-15750)

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists due to insufficient validation of user-supplied input processed by the salt-api component. A remote attacker can send a query request that submits malicious input, conduct directory traversal attack and determine what files exist on the system, and this information can be used to conduct further attacks.

2) Command injection (CVE-ID: CVE-2018-15751)

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

The vulnerability exists due to improper security restrictions imposed on the salt-api component. A remote attacker can use the salt-apicomponent to send a request that submits malicious input, bypass authentication and execute arbitrary commands on the system.

3) OS Command Injection (CVE-ID: CVE-2019-17361)

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

The vulnerability exists due to improper input validation the salt-api NET API with the ssh client enabled. A remote unauthenticated attacker with network access to the API endpoint can pass specially crafted data to the application and execute arbitrary OS commands on the salt-api host.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

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

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.

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

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

• https://ubuntu.com/security/notices/USN-4459-1