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Bug 1392702 - (CVE-2016-2123) CVE-2016-2123 samba: NDR Parsing ndr_pull_dnsp_name Heap-based Buffer Overflow Remote Code Execution Vulnerability (ZDI-CAN-3995)
CVE-2016-2123 samba: NDR Parsing ndr_pull_dnsp_name Heap-based Buffer Overflo...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
urgent Severity urgent
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Assigned To: Red Hat Product Security
impact=critical,public=20161219,repor...
: Security
Depends On:
Blocks: 1392703
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Reported: 2016-11-07 22:22 EST by Huzaifa S. Sidhpurwala
Modified: 2018-10-31 15:36 EDT (History)
13 users (show)

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Last Closed: 2016-12-16 01:31:17 EST
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Description Huzaifa S. Sidhpurwala 2016-11-07 22:22:07 EST
As per upstream:

The Samba routine ndr_pull_dnsp_name contains an integer wrap problem, leading to an attacker-controlled memory overwrite. ndr_pull_dnsp_name parses data from the Samba Active Directory ldb database.  Any user who can write to the dnsRecord attribute over LDAP can trigger this memory corruption.

By default, all authenticated LDAP users can write to the dnsRecord attribute on new DNS objects. This makes the defect a remote privilege escalation.
Comment 4 Huzaifa S. Sidhpurwala 2016-12-16 01:29:57 EST
Statement:

Red Hat Enterprise Linux 5, 6 and 7 are not affected by this flaw because we do not ship Samba with the AD DNS Server, which is the vulnerable component.
Comment 5 Huzaifa S. Sidhpurwala 2016-12-19 22:20:44 EST
External Reference:

https://www.samba.org/samba/security/CVE-2016-2123.html

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