CVE-2019-14861 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Reference

http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00038.html https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14861 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PJH3ROOFYMOATD2UEPC47P5RPBDTY77E/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WNKA4YIPV7AZR7KK3GW6L3HKGHSGJZFE/ https://security.gentoo.org/glsa/202003-52 https://security.netapp.com/advisory/ntap-20191210-0002/ https://usn.ubuntu.com/4217-1/ https://usn.ubuntu.com/4217-2/ https://www.samba.org/samba/security/CVE-2019-14861.html https://www.synology.com/security/advisory/Synology_SA_19_40

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.3