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CVE-2016-2123

Status Candidate

Overview

A flaw was found in samba versions 4.0.0 to 4.5.2. 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.

Related Files

Ubuntu Security Notice USN-3158-1
Posted Dec 19, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3158-1 - Frederic Besler and others discovered that the ndr_pull_dnsp_nam function in Samba contained an integer overflow. An authenticated attacker could use this to gain administrative privileges. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 16.10. Simo Sorce discovered that that Samba clients always requested a forwardable ticket when using Kerberos authentication. An attacker could use this to impersonate an authenticated user or service. Various other issues were also addressed.

tags | advisory, overflow
systems | linux, ubuntu
advisories | CVE-2016-2123, CVE-2016-2125, CVE-2016-2126
SHA-256 | c5fe62a970f183ffc5d75284e01fcf427714cde3f3e461393f730eee65e8054f
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