Update to Samba 4.11.6

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Update to Samba 4.11.5 - Security fixes for CVE-2019-14902, CVE-2019-14907 and CVE-2019-19344

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Oracle Linux 7 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2020-3981 advisory.

    - resolves: #1791208 - Fix CVE-2019-14907

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

According to the versions of the samba packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - An elevation of privilege vulnerability exists when an     attacker establishes a vulnerable Netlogon secure     channel connection to a domain controller, using the     Netlogon Remote Protocol (MS-NRPC), aka 'Netlogon     Elevation of Privilege Vulnerability'.(CVE-2020-1472)

  - A flaw was found in the AD DC NBT server in all Samba     versions before 4.10.17, before 4.11.11 and before     4.12.4. A samba user could send an empty UDP packet to     cause the samba server to crash.(CVE-2020-14303)

  - There is an issue in all samba 4.11.x versions before     4.11.5, all samba 4.10.x versions before 4.10.12 and     all samba 4.9.x versions before 4.9.18, where the     removal of the right to create or modify a subtree     would not automatically be taken away on all domain     controllers.(CVE-2019-14902)

  - All samba versions 4.9.x before 4.9.18, 4.10.x before     4.10.12 and 4.11.x before 4.11.5 have an issue where if     it is set with 'log level = 3' (or above) then the     string obtained from the client, after a failed     character conversion, is printed. Such strings can be     provided during the NTLMSSP authentication exchange. In     the Samba AD DC in particular, this may cause a     long-lived process(such as the RPC server) to     terminate. (In the file server case, the most likely     target, smbd, operates as process-per-client and so a     crash there is harmless).(CVE-2019-14907)

  - 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 (poorly named) dnsserver RPC pipe provides     administrative facilities to modify DNS records and     zones. Samba, when acting as an AD DC, stores DNS     records in LDAP. In AD, the default permissions on the     DNS partition allow creation of new records by     authenticated users. This is used for example to allow     machines to self-register in DNS. If a DNS record was     created that case-insensitively matched the name of the     zone, the ldb_qsort() and dns_name_compare() routines     could be confused into reading memory prior to the list     of DNS entries when responding to DnssrvEnumRecords()     or DnssrvEnumRecords2() and so following invalid memory     as a pointer.(CVE-2019-14861)

  - 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.(CVE-2019-14870)

  - A flaw was found in samba's Heimdal KDC implementation,     versions 4.8.x up to, excluding 4.8.12, 4.9.x up to,     excluding 4.9.8 and 4.10.x up to, excluding 4.10.3,     when used in AD DC mode. A man in the middle attacker     could use this flaw to intercept the request to the KDC     and replace the user name (principal) in the request     with any desired user name (principal) that exists in     the KDC effectively obtaining a ticket for that     principal.(CVE-2018-16860)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has samba packages installed that are affected by multiple vulnerabilities:

  - All samba versions 4.9.x before 4.9.18, 4.10.x before 4.10.12 and 4.11.x before 4.11.5 have an issue where     if it is set with log level = 3 (or above) then the string obtained from the client, after a failed     character conversion, is printed. Such strings can be provided during the NTLMSSP authentication exchange.
    In the Samba AD DC in particular, this may cause a long-lived process(such as the RPC server) to     terminate. (In the file server case, the most likely target, smbd, operates as process-per-client and so a     crash there is harmless). (CVE-2019-14907)

  - An elevation of privilege vulnerability exists when an attacker establishes a vulnerable Netlogon secure     channel connection to a domain controller, using the Netlogon Remote Protocol (MS-NRPC), aka 'Netlogon     Elevation of Privilege Vulnerability'. (CVE-2020-1472)

  - A null pointer dereference flaw was found in samba's Winbind service in versions before 4.11.15, before     4.12.9 and before 4.13.1. A local user could use this flaw to crash the winbind service causing denial of     service. (CVE-2020-14323)

  - A flaw was found in the way samba handled file and directory permissions. An authenticated user could use     this flaw to gain access to certain file and directory information which otherwise would be unavailable to     the attacker. (CVE-2020-14318)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2021:0077 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2019-10197:
    A flaw was found in samba versions 4.9.x up to 4.9.13, samba 4.10.x up to 4.10.8 and samba 4.11.x up to     4.11.0rc3, when certain parameters were set in the samba configuration file. An unauthenticated attacker     could use this flaw to escape the shared directory and access the contents of directories outside the     share.

    CVE-2019-10218:
    A flaw was found in the samba client, all samba versions before samba 4.11.2, 4.10.10 and 4.9.15, where a     malicious server can supply a pathname to the client with separators. This could allow the client to     access files and folders outside of the SMB network pathnames. An attacker could use this vulnerability to     create files outside of the current working directory using the privileges of the client user.

    CVE-2019-14907:
    All samba versions 4.9.x before 4.9.18, 4.10.x before 4.10.12 and 4.11.x before 4.11.5 have an issue where     if it is set with log level = 3 (or above) then the string obtained from the client, after a failed     character conversion, is printed. Such strings can be provided during the NTLMSSP authentication exchange.
    In the Samba AD DC in particular, this may cause a long-lived process(such as the RPC server) to     terminate. (In the file server case, the most likely target, smbd, operates as process-per-client and so a     crash there is harmless).

    CVE-2019-3880:
    A flaw was found in the way samba implemented an RPC endpoint emulating the Windows registry service API.
    An unprivileged attacker could use this flaw to create a new registry hive file anywhere they have unix     permissions which could lead to creation of a new file in the Samba share. Versions before 4.8.11, 4.9.6     and 4.10.2 are vulnerable.

    CVE-2020-14318:
    A flaw was found in the way samba handled file and directory permissions. An authenticated user could use     this flaw to gain access to certain file and directory information which otherwise would be unavailable to     the attacker.

    CVE-2020-14323:
    A null pointer dereference flaw was found in samba's Winbind service in versions before 4.11.15, before     4.12.9 and before 4.13.1. A local user could use this flaw to crash the winbind service causing denial of     service.

    CVE-2020-14383:
    A flaw was found in samba's DNS server. An authenticated user could use this flaw to the RPC server to     crash. This RPC server, which also serves protocols other than dnsserver, will be restarted after a short     delay, but it is easy for an authenticated non administrative attacker to crash it again as soon as it     returns. The Samba DNS server itself will continue to operate, but many RPC services will not.

    CVE-2020-1472:
    An elevation of privilege vulnerability exists when an attacker establishes a vulnerable Netlogon secure     channel connection to a domain controller, using the Netlogon Remote Protocol (MS-NRPC), aka 'Netlogon     Elevation of Privilege Vulnerability'.

    CVE-2020-25717:
    A flaw was found in the way Samba maps domain users to local users. An authenticated attacker could use     this flaw to cause possible privilege escalation.

    CVE-2021-20254:
    A flaw was found in samba. The Samba smbd file server must map Windows group identities (SIDs) into unix     group ids (gids). The code that performs this had a flaw that could allow it to read data beyond the end     of the array in the case where a negative cache entry had been added to the mapping cache. This could     cause the calling code to return those values into the process token that stores the group membership for     a user. The highest threat from this vulnerability is to data confidentiality and integrity.

    CVE-2021-23192:
    A flaw was found in the way samba implemented DCE/RPC. 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.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
133425	Fedora 31 : 2:samba (2020-6bd386c7eb)	Nessus	Fedora Local Security Checks	2/3/2020	2/5/2020	medium
180964	Oracle Linux 7 : samba (ELSA-2020-3981)	Nessus	Oracle Linux Local Security Checks	9/7/2023	11/1/2024	medium
142333	EulerOS 2.0 SP2 : samba (EulerOS-SA-2020-2396)	Nessus	Huawei Local Security Checks	11/3/2020	1/12/2026	high
147360	NewStart CGSL CORE 5.04 / MAIN 5.04 : samba Multiple Vulnerabilities (NS-SA-2021-0024)	Nessus	NewStart CGSL Local Security Checks	3/10/2021	1/12/2026	medium
236653	Alibaba Cloud Linux 3 : 0077: samba (ALINUX3-SA-2021:0077)	Nessus	Alibaba Cloud Linux Local Security Checks	5/14/2025	12/17/2025	critical

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