Test ID:	1.3.6.1.4.1.25623.1.0.844634
Category:	Ubuntu Local Security Checks
Title:	Ubuntu: Security Advisory for samba (USN-4559-1)
Summary:	The remote host is missing an update for the 'samba'; package(s) announced via the USN-4559-1 advisory.
Description:	Summary: The remote host is missing an update for the 'samba' package(s) announced via the USN-4559-1 advisory. Vulnerability Insight: Tom Tervoort discovered that the Netlogon protocol implemented by Samba incorrectly handled the authentication scheme. A remote attacker could use this issue to forge an authentication token and steal the credentials of the domain admin. While a previous security update fixed the issue by changing the 'server schannel' setting to default to 'yes', instead of 'auto', which forced a secure netlogon channel, this update provides additional improvements. For compatibility reasons with older devices, Samba now allows specifying an insecure netlogon configuration per machine. In addition, this update adds additional server checks for the protocol attack in the client-specified challenge to provide some protection when 'server schannel = no/auto' and avoid the false-positive results when running the proof-of-concept exploit. Affected Software/OS: 'samba' package(s) on Ubuntu 20.04 LTS, Ubuntu 18.04 LTS, Ubuntu 16.04 LTS. Solution: Please install the updated package(s). CVSS Score: 9.3 CVSS Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2020-1472 CERT/CC vulnerability note: VU#490028 https://www.kb.cert.org/vuls/id/490028 https://www.synology.com/security/advisory/Synology_SA_20_21 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/H4OTFBL6YDVFH2TBJFJIE4FMHPJEEJK3/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TAPQQZZAT4TG3XVRTAFV2Y3S7OAHFBUP/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ST6X3A2XXYMGD4INR26DQ4FP4QSM753B/ https://security.gentoo.org/glsa/202012-24 http://packetstormsecurity.com/files/159190/Zerologon-Proof-Of-Concept.html http://packetstormsecurity.com/files/160127/Zerologon-Netlogon-Privilege-Escalation.html https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1472 https://www.oracle.com/security-alerts/cpuApr2021.html https://lists.debian.org/debian-lts-announce/2020/11/msg00041.html http://www.openwall.com/lists/oss-security/2020/09/17/2 SuSE Security Announcement: openSUSE-SU-2020:1513 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00080.html SuSE Security Announcement: openSUSE-SU-2020:1526 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00086.html https://usn.ubuntu.com/4510-1/ https://usn.ubuntu.com/4510-2/ https://usn.ubuntu.com/4559-1/
Copyright	Copyright (C) 2020 Greenbone Networks GmbH

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