CVE-2019-14861

Publication date 10 December 2019

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

5.3 · Medium

Score breakdown

All Samba versions 4.x.x before 4.9.17, 4.10.x before 4.10.11 and 4.11.x before 4.11.3 have an issue, where the (poorly named) dnsserver RPC pipe provides administrative facilities to modify DNS records and zones. Samba, when acting as an AD DC, stores DNS records in LDAP. In AD, the default permissions on the DNS partition allow creation of new records by authenticated users. This is used for example to allow machines to self-register in DNS. If a DNS record was created that case-insensitively matched the name of the zone, the ldb_qsort() and dns_name_compare() routines could be confused into reading memory prior to the list of DNS entries when responding to DnssrvEnumRecords() or DnssrvEnumRecords2() and so following invalid memory as a pointer.

Status

Package Ubuntu Release Status
samba 19.10 eoan
Fixed 2:4.10.7+dfsg-0ubuntu2.3
19.04 disco
Fixed 2:4.10.0+dfsg-0ubuntu2.7
18.04 LTS bionic
Fixed 2:4.7.6+dfsg~ubuntu-0ubuntu2.14
16.04 LTS xenial
Fixed 2:4.3.11+dfsg-0ubuntu0.16.04.24
14.04 LTS trusty

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Severity score breakdown

Parameter Value
Base score 5.3 · Medium
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-4217-2
    • Samba vulnerabilities
    • 11 December 2019
    • USN-4217-1
    • Samba vulnerabilities
    • 10 December 2019

Other references