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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3774 samba security update 10 November 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: samba Publisher: Debian Operating System: Debian GNU/Linux UNIX variants (UNIX, Linux, OSX) Windows Impact/Access: Increased Privileges -- Existing Account Denial of Service -- Existing Account Provide Misleading Information -- Existing Account Reduced Security -- Remote/Unauthenticated Unauthorised Access -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-23192 CVE-2021-3738 CVE-2020-25722 CVE-2020-25721 CVE-2020-25719 CVE-2020-25718 CVE-2020-25717 CVE-2016-2124 Original Bulletin: https://lists.debian.org/debian-security-announce/2021/msg00188.html Comment: This advisory references vulnerabilities in products which run on platforms other than Debian. It is recommended that administrators running samba check for an updated version of the software for their operating system. - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 - - ------------------------------------------------------------------------- Debian Security Advisory DSA-5003-1 security@debian.org https://www.debian.org/security/ Salvatore Bonaccorso November 09, 2021 https://www.debian.org/security/faq - - ------------------------------------------------------------------------- Package : samba CVE ID : CVE-2016-2124 CVE-2020-25717 CVE-2020-25718 CVE-2020-25719 CVE-2020-25721 CVE-2020-25722 CVE-2021-3738 CVE-2021-23192 Several vulnerabilities have been discovered in Samba, a SMB/CIFS file, print, and login server for Unix. CVE-2016-2124 Stefan Metzmacher reported that SMB1 client connections can be downgraded to plaintext authentication. CVE-2020-25717 Andrew Bartlett reported that Samba may map domain users to local users in an undesired way, allowing for privilege escalation. The update introduces a new parameter "min domain uid" (default to 1000) to not accept a UNIX uid below this value. CVE-2020-25718 Andrew Bartlett reported that Samba as AD DC, when joined by an RODC, did not confirm if the RODC was allowed to print a ticket for that user, allowing an RODC to print administrator tickets. CVE-2020-25719 Andrew Bartlett reported that Samba as AD DC, did not always rely on the SID and PAC in Kerberos tickets and could be confused about the user a ticket represents. If a privileged account was attacked this could lead to total domain compromise. CVE-2020-25721 Andrew Bartlett reported that Samba as a AD DC did not provide a way for Linux applications to obtain a reliable SID (and samAccountName) in issued tickets. CVE-2020-25722 Andrew Bartlett reported that Samba as AD DC did not do sufficient access and conformance checking of data stored, potentially allowing total domain compromise. CVE-2021-3738 William Ross reported that the Samba AD DC RPC server can use memory that was free'd when a sub-connection is closed, resulting in denial of service, and potentially, escalation of privileges. CVE-2021-23192 Stefan Metzmacher reported that if a client to a Samba server sent a very large DCE/RPC request, and chose to fragment it, an attacker could replace later fragments with their own data, bypassing the signature requirements. For the stable distribution (bullseye), these problems have been fixed in version 2:4.13.13+dfsg-1~deb11u2. We recommend that you upgrade your samba packages. For the detailed security status of samba please refer to its security tracker page at: https://security-tracker.debian.org/tracker/samba Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: debian-security-announce@lists.debian.org - -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEERkRAmAjBceBVMd3uBUy48xNDz0QFAmGKwX5fFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldDQ2 NDQ0MDk4MDhDMTcxRTA1NTMxRERFRTA1NENCOEYzMTM0M0NGNDQACgkQBUy48xND z0R2eRAAk7NBLcriA0piVGV1+8+z2842CI5iGbl5eGQN4WynPM5KvKxxEIoXJ6Ez VqKB5bz1lxMl6LenRAHej4XEXvT2HijAdhTHTOzXGfz72YeDO9a30O5H8pjIEG54 7Nkx+BRXcky53Gz94dxPIv0acyyYQs97lMGPreVzbTZnODv+5OQpkFGXCoYOsXFx xwXLVagaOGu0GD82ZANnP7U9/+4EDlFQjYCwB2Abu6GuxT76WDLHthiJgA3IzWcm CAscmokRIbA6D3tnbpGlorw8BS1UGdCERcC7lFxe+hl+MN6OkA5HmaKY8OdrRrwz ONWGSm0yCVjlIUCAoyiyzPwYSmKp6/cF2PbZrhAaWlka/oOH7Ay9+LrQuV7/bu8C BQnPxUtvOEXnpiOT/4C9MEHV1hxFmuk7AUAYx4RXBeqhrkLkh1rOzvunSyrcwJ+O UlDhaxXCDe80nwl711HlJNJEt7Z2hxqM9M5ts94RBp3UPB5NQz1v7qQC+KnZfaRW J3KUUsMRHF9nAlIPxUwKrTV1VLQc1rl7/RrTh0rAZbouoXvYlQpfmJ1lPI95t6KJ cwJQ9TTQPaP7RQ8Bg3nYpJ+fCvzjeuk0rm4U+ZRb6cH41URlsFujg4X1AjCHLUUB B6xlNyMHuDnLAW/YRnwhZnQYqg63HX0kmaUZtbN+172rzTHScuA= =1OLX - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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