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CVE-2019-14861

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-4217-2
Posted Dec 12, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4217-2 - USN-4217-1 fixed several vulnerabilities in Samba. This update provides the corresponding update for Ubuntu 14.04 ESM. Andreas Oster discovered that the Samba DNS management server incorrectly handled certain records. An authenticated attacker could possibly use this issue to crash Samba, resulting in a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, vulnerability
systems | linux, ubuntu
advisories | CVE-2019-14861, CVE-2019-14870
MD5 | 8f8bc5296135141a6c216b6ebef1839a
Ubuntu Security Notice USN-4217-1
Posted Dec 10, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4217-1 - Andreas Oster discovered that the Samba DNS management server incorrectly handled certain records. An authenticated attacker could possibly use this issue to crash Samba, resulting in a denial of service. Isaac Boukris discovered that Samba did not enforce the Kerberos DelegationNotAllowed feature restriction, contrary to expectations.

tags | advisory, denial of service
systems | linux, ubuntu
advisories | CVE-2019-14861, CVE-2019-14870
MD5 | 35c60fc6f144781461cde60315d43abf
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