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AUSCERT External Security Bulletin Redistribution
ESB-2020.1756
salt -- multiple vulnerabilities in salt-master process
18 May 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: salt
Publisher: FreeBSD
Operating System: FreeBSD
Impact/Access: Root Compromise -- Remote/Unauthenticated
Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-11652 CVE-2020-11651
Reference: ESB-2020.1607.2
ESB-2020.1547
Original Bulletin:
http://www.vuxml.org/freebsd/6bf55af9-973b-11ea-9f2c-38d547003487.html
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salt -- multiple vulnerabilities in salt-master process
Affected packages
py27-salt < 2019.2.4
3000 <= py27-salt < 3000.2
py32-salt < 2019.2.4
3000 <= py32-salt < 3000.2
py33-salt < 2019.2.4
3000 <= py33-salt < 3000.2
py34-salt < 2019.2.4
3000 <= py34-salt < 3000.2
py35-salt < 2019.2.4
3000 <= py35-salt < 3000.2
py36-salt < 2019.2.4
3000 <= py36-salt < 3000.2
py37-salt < 2019.2.4
3000 <= py37-salt < 3000.2
py38-salt < 2019.2.4
3000 <= py38-salt < 3000.2
Details
VuXML ID 6bf55af9-973b-11ea-9f2c-38d547003487
Discovery 2020-04-30
Entry 2020-05-16
F-Secure reports:
CVE-2020-11651 - Authentication bypass vulnerabilities
The ClearFuncs class processes unauthenticated requests and unintentionally
exposes the _send_pub() method, which can be used to queue messages
directly on the master publish server. Such messages can be used to trigger
minions to run arbitrary commands as root.
The ClearFuncs class also exposes the method _prep_auth_info(), which
returns the "root key" used to authenticate commands from the local root
user on the master server. This "root key" can then be used to remotely
call administrative commands on the master server. This unintentional
exposure provides a remote un-authenticated attacker with root-equivalent
access to the salt master.
CVE-2020-11652 - Directory traversal vulnerabilities
The wheel module contains commands used to read and write files under
specific directory paths. The inputs to these functions are concatenated
with the target directory and the resulting path is not canonicalized,
leading to an escape of the intended path restriction.
The get_token() method of the salt.tokens.localfs class (which is exposed
to unauthenticated requests by the ClearFuncs class) fails to sanitize the
token input parameter which is then used as a filename, allowing insertion
of ".." path elements and thus reading of files outside of the intended
directory. The only restriction is that the file has to be deserializable
by salt.payload.Serial.loads().
[source]
References
CVE CVE-2020-11651
Name
CVE CVE-2020-11652
Name
URL https://blog.f-secure.com/
new-vulnerabilities-make-exposed-salt-hosts-easy-targets/
URL https://docs.saltstack.com/en/latest/topics/releases/2019.2.4.html
URL https://labs.f-secure.com/advisories/saltstack-authorization-bypass
URL https://nvd.nist.gov/vuln/detail/CVE-2020-11651
URL https://nvd.nist.gov/vuln/detail/CVE-2020-11652
URL https://www.tenable.com/blog/
cve-2020-11651-cve-2020-11652-critical-salt-framework-vulnerabilities-exploited-in-the-wild
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