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)
Summary: CVE-2016-2123 samba: NDR Parsing ndr_pull_dnsp_name Heap-based Buffer Overflo...
Status: CLOSED NOTABUG
Alias: CVE-2016-2123
Product: Security Response
Classification: Other
Component: vulnerability   
(Show other bugs)
Version: unspecified
Hardware: All
OS: Linux
urgent
urgent
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=critical,public=20161219,repor...
Keywords: Security
Depends On:
Blocks: 1392703
TreeView+ depends on / blocked
 
Reported: 2016-11-08 03:22 UTC by Huzaifa S. Sidhpurwala
Modified: 2018-10-31 19:36 UTC (History)
13 users (show)

Fixed In Version:
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Environment:
Last Closed: 2016-12-16 06:31:17 UTC
Type: ---
Regression: ---
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Documentation: ---
CRM:
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


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Description Huzaifa S. Sidhpurwala 2016-11-08 03:22:07 UTC
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 06:29:57 UTC
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 2016-12-20 03:20:44 UTC
External Reference:

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


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