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Bug 672140 (CVE-2018-14629, CVE-2018-16841, CVE-2018-16851, CVE-2018-16852, CVE-2018-16853, CVE-2018-16857)

Summary: <net-fs/samba-{4.7.12,4.8.7,4.9.3}: multiple vulnerabilities (CVE-2018-{14629,16841,16851,16852,16853,16857})
Product: Gentoo Security Reporter: Lars Wendler (Polynomial-C) (RETIRED) <polynomial-c>
Component: VulnerabilitiesAssignee: Gentoo Security <security>
Severity: minor CC: samba
Priority: Normal    
Version: unspecified   
Hardware: All   
OS: Linux   
Whiteboard: B3 [glsa+ cve]
Package list:
Runtime testing required: ---
Bug Depends on: 693558    
Bug Blocks:    

Description Lars Wendler (Polynomial-C) (RETIRED) gentoo-dev 2018-11-28 09:12:55 UTC
CVE-2018-16852 and CVE-2018-16857 affect 4.9 only.


o  CVE-2018-14629:
   All versions of Samba from 4.0.0 onwards are vulnerable to infinite
   query recursion caused by CNAME loops. Any dns record can be added via
   ldap by an unprivileged user using the ldbadd tool, so this is a
   security issue.

o  CVE-2018-16841:
   When configured to accept smart-card authentication, Samba's KDC will call
   talloc_free() twice on the same memory if the principal in a validly signed
   certificate does not match the principal in the AS-REQ.

   This is only possible after authentication with a trusted certificate.

   talloc is robust against further corruption from a double-free with
   talloc_free() and directly calls abort(), terminating the KDC process.

   There is no further vulnerability associated with this issue, merely a
   denial of service.

o  CVE-2018-16851:
   During the processing of an LDAP search before Samba's AD DC returns
   the LDAP entries to the client, the entries are cached in a single
   memory object with a maximum size of 256MB.  When this size is
   reached, the Samba process providing the LDAP service will follow the
   NULL pointer, terminating the process.

   There is no further vulnerability associated with this issue, merely a
   denial of service.

o  CVE-2018-16852:
   During the processing of an DNS zone in the DNS management DCE/RPC server,
   the internal DNS server or the Samba DLZ plugin for BIND9, if the
   property is set, the server will follow a NULL pointer and terminate.

   There is no further vulnerability associated with this issue, merely a
   denial of service.

o  CVE-2018-16853:
   A user in a Samba AD domain can crash the KDC when Samba is built in the
   non-default MIT Kerberos configuration.

   With this advisory we clarify that the MIT Kerberos build of the Samba
   AD DC is considered experimental.  Therefore the Samba Team will not
   issue security patches for this configuration.

o  CVE-2018-16857:
   AD DC Configurations watching for bad passwords (to restrict brute forcing
   of passwords) in a window of more than 3 minutes may not watch for bad
   passwords at all.
Comment 1 Thomas Deutschmann (RETIRED) gentoo-dev 2020-03-25 16:30:16 UTC
Added to an existing GLSA.
Comment 2 GLSAMaker/CVETool Bot gentoo-dev 2020-03-25 16:36:48 UTC
This issue was resolved and addressed in
 GLSA 202003-52 at
by GLSA coordinator Thomas Deutschmann (whissi).