Bug 1584801 (CVE-2018-10847)

Summary: CVE-2018-10847 prosody: cross-host authentication vulnerability
Product: [Other] Security Response Reporter: Robert Scheck <redhat-bugzilla>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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Fixed In Version: prosody 0.10.2, prosody 0.9.14 Doc Type: If docs needed, set a value
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Last Closed: 2021-10-21 20:05:19 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Robert Scheck 2018-05-31 17:10:47 UTC 
Prosody did not verify that the virtual host associated with a user
session remained the same across stream restarts.

In practice this means that a user may authenticate to XMPP host A and
migrate their authenticated session to XMPP host B of the same Prosody
instance.

Note that successful authentication to host A is required to initiate
the attack. This includes SASL ANONYMOUS.

Overriding the authenticated username is not possible via this exploit,
and this limits impersonation to usernames on host B that the attacker
also has access to on host A. In the case of ANONYMOUS authentication,
the username is random and enforced by the server.

If a user has the account user1, they may impersonate 
user1, with security policies of host B applied.

External References:
 - https://prosody.im/security/advisory_20180531/
 - https://blog.prosody.im/prosody-0-10-2-security-release/
 - https://issues.prosody.im/1147
Comment 1 Robert Scheck 2018-05-31 17:35:23 UTC 
This has been fixed in:

 - https://koji.fedoraproject.org/koji/buildinfo?buildID=1087840
 - https://bodhi.fedoraproject.org/updates/FEDORA-2018-18f8c6ce79
 - https://bodhi.fedoraproject.org/updates/FEDORA-2018-455803056d
 - https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2018-7155fb2e51
 - https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2018-1ceee884b4
Comment 2 Sam Fowler 2018-06-01 00:49:22 UTC 
External References:

https://prosody.im/security/advisory_20180531/
https://blog.prosody.im/prosody-0-10-2-security-release/


Upstream issue:

https://issues.prosody.im/1147