TI-2016-01946 Aliases CVE-2016-2123 GHSA-m2v2-w4f9-rmq6

Heap-based buffer overflow in [UNKNOWN] samba

MEDIUM 47CWE-122Published 2018-11-01 · Updated 2024-08-05

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-122 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.06226 93rd percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
[UNKNOWN]	samba	versions 4.0.0 to 4.5.2	—	No fix listed	CNA

samba Vendor[UNKNOWN] Affected versions 4.0.0 to 4.5.2 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:samba:samba::::::::	4.0.0 – 4.0.26; 4.1.0 – 4.1.23; 4.2.0 – 4.2.14; 4.3.0 to before 4.3.13; 4.4.0 to before 4.4.8; 4.5.0 to before 4.5.3	Vulnerable	Samba

cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* Versions 4.0.0 – 4.0.26; 4.1.0 – 4.1.23; 4.2.0 – 4.2.14; 4.3.0 to before 4.3.13; 4.4.0 to before 4.4.8; 4.5.0 to before 4.5.3 Vulnerable ·Samba

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Critical. Red Hat's page for this CVE →

Not affected: 4 products

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Storage 3

Timeline

2026-10-02 Threatist record created from CVE-2016-2123
2026-10-03 Alias added: GHSA-m2v2-w4f9-rmq6

References

Patch 1

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

Other 1

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-2123

TI-2020-01431 Netlogon Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 10.0
TI-2017-05139 Code injection in samba KEVCVSS 3.1CRITICAL 9.8
TI-2015-00210 The Netlogon server implementation in smbd in Samba 3.5.x and 3.6.x before 3.6.25, 4.0.x… CVSS 2.0HIGH 10.0
TI-2003-00081 Buffer overflow in the SMB/CIFS packet fragment re-assembly code for SMB daemon (smbd) in… CVSS 2.0HIGH 10.0
TI-2003-00185 Buffer overflow in the call_trans2open function in trans2.c for Samba 2.2.x before… CVSS 2.0HIGH 10.0
TI-2007-02362 Multiple heap-based buffer overflows in the NDR parsing in smbd in Samba 3.0.0 through… CVSS 2.0HIGH 10.0

See all 215 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences