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CVE-2019-14870

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 S4U (MS-SFU) Kerberos delegation model includes a feature allowing for a subset of clients to be opted out of constrained delegation in any way, either S4U2Self or regular Kerberos authentication, by forcing all tickets for these clients to be non-forwardable. In AD this is implemented by a user attribute delegation_not_allowed (aka not-delegated), which translates to disallow-forwardable. However the Samba AD DC does not do that for S4U2Self and does set the forwardable flag even if the impersonated client has the not-delegated flag set.

Related Files

Gentoo Linux Security Advisory 202003-52
Posted Mar 26, 2020
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202003-52 - Multiple vulnerabilities have been found in Samba, the worst of which could lead to remote code execution. Versions less than 4.11.6 are affected.

tags | advisory, remote, vulnerability, code execution
systems | linux, gentoo
advisories | CVE-2018-10858, CVE-2018-10918, CVE-2018-10919, CVE-2018-1139, CVE-2018-1140, CVE-2018-14629, CVE-2018-16841, CVE-2018-16851, CVE-2018-16852, CVE-2018-16853, CVE-2018-16857, CVE-2018-16860, CVE-2019-10197, CVE-2019-14861, CVE-2019-14870, CVE-2019-14902, CVE-2019-14907, CVE-2019-19344
SHA-256 | 78ecd3bc02b0f10129021084736ee7cc0c9408898c589745d90193370efe75aa
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
SHA-256 | 6db26f2e489f1384d2f218d9e2544521385fb447c71f37e016d74825ac3f8bbb
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
SHA-256 | 51b01c1767b0bdb132c8d865c0a4fae6ca8ba99c8b662d627473d2bc026ba909
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