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.
Published 2018-11-01 13:29:00
Updated 2024-02-08 02:10:35
Source Red Hat, Inc.
View at NVD,   CVE.org
Vulnerability category: OverflowMemory CorruptionGain privilege

Exploit prediction scoring system (EPSS) score for CVE-2016-2123

Probability of exploitation activity in the next 30 days: 95.92%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 99 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2016-2123

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
6.5
MEDIUM AV:N/AC:L/Au:S/C:P/I:P/A:P
8.0
6.4
NIST
8.1
HIGH CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
2.2
5.9
Red Hat, Inc.
8.8
HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
2.8
5.9
NIST

CWE ids for CVE-2016-2123

  • The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.
    Assigned by: nvd@nist.gov (Secondary)
  • A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
    Assigned by: secalert@redhat.com (Primary)

References for CVE-2016-2123

Products affected by CVE-2016-2123

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