CVE-2016-2123

Publication date 19 December 2016

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

From the Ubuntu Security Team

Frederic Besler and others discovered that the routine ndr_pull_dnsp_nam in Samba contained an integer overflow. An authenticated attacker could use this to gain administrative privileges.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
samba	17.04 zesty	Fixed 2:4.4.5+dfsg-2ubuntu7
	16.10 yakkety	Fixed 2:4.4.5+dfsg-2ubuntu5.2
	16.04 LTS xenial	Fixed 2:4.3.11+dfsg-0ubuntu0.16.04.3
	14.04 LTS trusty	Fixed 2:4.3.11+dfsg-0ubuntu0.14.04.4
	12.04 LTS precise	Not affected
samba4	17.04 zesty	Not in release
	16.10 yakkety	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
	12.04 LTS precise	Ignored

Notes

mdeslaur

4.0.0+ only

Severity score breakdown

Parameter	Value
Base score	8.8 · High
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-3158-1
Samba vulnerabilities
19 December 2016