[SECURITY] [DLA 2463-1] samba security update

Debian LTS Advisory DLA-2463-1 [email protected]
https://www.debian.org/lts/security/ Roberto C. Sánchez
November 22, 2020 https://wiki.debian.org/LTS

Package : samba
Version : 2:4.5.16+dfsg-1+deb9u3
CVE ID : CVE-2020-1472 CVE-2020-10704 CVE-2020-10730 CVE-2020-10745
CVE-2020-10760 CVE-2020-14303 CVE-2020-14318 CVE-2020-14323
CVE-2020-14383

Multiple vulnerabilities have been discovered in Samba, a SMB/CIFS file,
print, and login server for Unix.

CVE-2020-1472

Unauthenticated domain controller compromise by subverting Netlogon
cryptography.  This vulnerability includes both ZeroLogon and
non-ZeroLogon variations.

CVE-2020-10704

An unauthorized user can trigger a denial of service via a stack
overflow in the AD DC LDAP server.

CVE-2020-10730

NULL pointer de-reference and use-after-free in Samba AD DC LDAP
Server with ASQ, VLV and paged_results.

CVE-2020-10745

Denial of service resulting from abuse of compression of replies to
NetBIOS over TCP/IP name resolution and DNS packets causing excessive
CPU load on the Samba AD DC.

CVE-2020-10760

The use of the paged_results or VLV controls against the Global
Catalog LDAP server on the AD DC will cause a use-after-free.

CVE-2020-14303

Denial of service resulting from CPU spin and and inability to
process further requests once the AD DC NBT server receives an empty
(zero-length) UDP packet to port 137.

CVE-2020-14318

Missing handle permissions check in ChangeNotify

CVE-2020-14323

Unprivileged user can crash winbind via invalid lookupsids DoS

CVE-2020-14383

DNS server crash via invalid records resulting from uninitialized
variables

For Debian 9 stretch, these problems have been fixed in version
2:4.5.16+dfsg-1+deb9u3.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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