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Bug 1610640 - (CVE-2018-10918) CVE-2018-10918 samba: DsCrackNames on a user without an SPN can trigger NULL-pointer de-reference
CVE-2018-10918 samba: DsCrackNames on a user without an SPN can trigger NULL-...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20180816,repor...
: Security
Depends On: 1617913 1612807 1617910
Blocks: 1610646
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Reported: 2018-08-01 01:29 EDT by Sam Fowler
Modified: 2018-09-25 23:39 EDT (History)
31 users (show)

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Fixed In Version: samba 4.7.9, samba 4.8.4
Doc Type: If docs needed, set a value
Doc Text:
A null pointer dereference flaw was found in the way samba checked database outputs from the LDB database layer. An authenticated attacker could use this flaw to crash a samba server in an Active Diretory Domain Controller configuration.
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RHEL 7.3 requirements from Atomic Host:
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Description Sam Fowler 2018-08-01 01:29:33 EDT 
As per upstream advisory:

All versions of Samba from 4.7.0 onwards are vulnerable to a denial of service attack which can crash the "samba" process when Samba is an Active Directory Domain Controller.

Missing database output checks on the returned directory attributes from the LDB database layer cause the DsCrackNames call in the DRSUAPI server to crash when following a NULL pointer.

This call is only available after authentication.

There is no further vulnerability associated with this error, merely a denial of service.
Comment 2 Sam Fowler 2018-08-15 23:39:27 EDT 
External Reference:

https://www.samba.org/samba/security/CVE-2018-10918.html
Comment 3 Sam Fowler 2018-08-16 03:13:22 EDT 
Created samba tracking bugs for this issue:

Affects: fedora-all [bug 1617910]
Comment 5 Huzaifa S. Sidhpurwala 2018-08-17 01:38:30 EDT 
Acknowledgments:

Name: Volker Mauel (the Samba project)
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