| Summary: | CVE-2018-16857 samba: Bad password count in AD DC not always effective | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Andrej Nemec <anemec> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED NOTABUG | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | abhgupta, abokovoy, anoopcs, asn, bmcclain, dbaker, dblechte, dfediuck, eedri, gdeschner, jokerman, jrivera, jstephen, lmohanty, madam, mgoldboi, michal.skrivanek, rhs-smb, sankarshan, sbonazzo, sbose, security-response-team, sherold, sisharma, smohan, ssaha, ssorce, sthangav, trankin, vbellur |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | samba 4.9.3 | Doc Type: | If docs needed, set a value |
| Doc Text: |
It was found that the 'bad password observation window' was ineffective when set to a value greater than 3 minutes. This could allow for brute force password attacks in some situations.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2018-11-28 07:40:40 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Bug Depends On: | 1654095 | ||
| Bug Blocks: | |||
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Description
Andrej Nemec
2018-11-13 10:12:08 UTC
Mitigation: Bad password lockout is not configured by default, it is only effective if a threshold has been set with (eg): samba-tool domain passwordsettings set --account-lockout-threshold=3 To mitigate the issue set a shorter 'Reset account lockout after' window (the ineffective default is 30, anything less than 15 will work): samba-tool domain passwordsettings set --reset-account-lockout-after=15 NOTE: If a fine-grained password policy (PSO) is set, this must also be done on each PSO. External Reference: https://www.samba.org/samba/security/CVE-2018-16857.html Acknowledgments: Name: the Samba project Upstream: Isaac Boukris Created samba tracking bugs for this issue: Affects: fedora-all [bug 1654095] Statement: This flaw does not affect the version of samba shipped with Red Hat Enterprise Linux because there is no support for samba as Active Directory Domain Controller. |