Amazon Linux AMI update for samba



Published: 2021-01-14 | Updated: 2022-09-22
Risk High
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2020-14318
CVE-2020-14323
CVE-2020-1472
CWE-ID CWE-264
CWE-476
Exploitation vector Network
Public exploit Vulnerability #3 is being exploited in the wild.
Vulnerable software
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Amazon Linux AMI
Operating systems & Components / Operating system

Vendor Amazon Web Services

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU47990

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2020-14318

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote user to gain access to sensitive information.

The vulnerability exists due to the way "ChangeNotify" concept for SMB1/2/3 protocols was implemented in Samba. A missing permissions check on a directory handle requesting ChangeNotify means that a client with a directory handle open only for FILE_READ_ATTRIBUTES (minimal access rights) could be used to obtain change notify replies from the server. These replies contain information that should not be available to directory handles open for FILE_READ_ATTRIBUTE only. A local unprivileged user can abuse this lack of permissions check to obtain information about file changes.

Mitigation

Update the affected packages:

i686:
    samba-client-4.10.16-9.56.amzn1.i686
    samba-libs-4.10.16-9.56.amzn1.i686
    samba-common-libs-4.10.16-9.56.amzn1.i686
    ctdb-4.10.16-9.56.amzn1.i686
    libwbclient-4.10.16-9.56.amzn1.i686
    samba-client-libs-4.10.16-9.56.amzn1.i686
    samba-debuginfo-4.10.16-9.56.amzn1.i686
    libsmbclient-devel-4.10.16-9.56.amzn1.i686
    samba-winbind-modules-4.10.16-9.56.amzn1.i686
    samba-python-test-4.10.16-9.56.amzn1.i686
    samba-krb5-printing-4.10.16-9.56.amzn1.i686
    samba-devel-4.10.16-9.56.amzn1.i686
    libsmbclient-4.10.16-9.56.amzn1.i686
    samba-python-4.10.16-9.56.amzn1.i686
    samba-4.10.16-9.56.amzn1.i686
    samba-winbind-4.10.16-9.56.amzn1.i686
    samba-test-libs-4.10.16-9.56.amzn1.i686
    samba-common-tools-4.10.16-9.56.amzn1.i686
    libwbclient-devel-4.10.16-9.56.amzn1.i686
    samba-winbind-clients-4.10.16-9.56.amzn1.i686
    ctdb-tests-4.10.16-9.56.amzn1.i686
    samba-winbind-krb5-locator-4.10.16-9.56.amzn1.i686
    samba-test-4.10.16-9.56.amzn1.i686

noarch:
    samba-pidl-4.10.16-9.56.amzn1.noarch
    samba-common-4.10.16-9.56.amzn1.noarch

src:
    samba-4.10.16-9.56.amzn1.src

x86_64:
    samba-winbind-modules-4.10.16-9.56.amzn1.x86_64
    libwbclient-devel-4.10.16-9.56.amzn1.x86_64
    samba-4.10.16-9.56.amzn1.x86_64
    samba-client-4.10.16-9.56.amzn1.x86_64
    samba-common-tools-4.10.16-9.56.amzn1.x86_64
    samba-client-libs-4.10.16-9.56.amzn1.x86_64
    libwbclient-4.10.16-9.56.amzn1.x86_64
    samba-test-4.10.16-9.56.amzn1.x86_64
    samba-python-4.10.16-9.56.amzn1.x86_64
    ctdb-4.10.16-9.56.amzn1.x86_64
    samba-winbind-clients-4.10.16-9.56.amzn1.x86_64
    samba-devel-4.10.16-9.56.amzn1.x86_64
    libsmbclient-4.10.16-9.56.amzn1.x86_64
    samba-krb5-printing-4.10.16-9.56.amzn1.x86_64
    samba-libs-4.10.16-9.56.amzn1.x86_64
    samba-winbind-4.10.16-9.56.amzn1.x86_64
    samba-test-libs-4.10.16-9.56.amzn1.x86_64
    samba-winbind-krb5-locator-4.10.16-9.56.amzn1.x86_64
    libsmbclient-devel-4.10.16-9.56.amzn1.x86_64
    samba-python-test-4.10.16-9.56.amzn1.x86_64
    samba-debuginfo-4.10.16-9.56.amzn1.x86_64
    samba-common-libs-4.10.16-9.56.amzn1.x86_64
    ctdb-tests-4.10.16-9.56.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions


CPE2.3 External links

http://alas.aws.amazon.com/ALAS-2021-1469.html

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

2) NULL pointer dereference

EUVDB-ID: #VU47991

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2020-14323

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error when processing requests in winbind in Samba. A remote user can send specially crafted request to winbind daemon, trigger a NULL pointer dereference error and crash it.

Mitigation

Update the affected packages:

i686:
    samba-client-4.10.16-9.56.amzn1.i686
    samba-libs-4.10.16-9.56.amzn1.i686
    samba-common-libs-4.10.16-9.56.amzn1.i686
    ctdb-4.10.16-9.56.amzn1.i686
    libwbclient-4.10.16-9.56.amzn1.i686
    samba-client-libs-4.10.16-9.56.amzn1.i686
    samba-debuginfo-4.10.16-9.56.amzn1.i686
    libsmbclient-devel-4.10.16-9.56.amzn1.i686
    samba-winbind-modules-4.10.16-9.56.amzn1.i686
    samba-python-test-4.10.16-9.56.amzn1.i686
    samba-krb5-printing-4.10.16-9.56.amzn1.i686
    samba-devel-4.10.16-9.56.amzn1.i686
    libsmbclient-4.10.16-9.56.amzn1.i686
    samba-python-4.10.16-9.56.amzn1.i686
    samba-4.10.16-9.56.amzn1.i686
    samba-winbind-4.10.16-9.56.amzn1.i686
    samba-test-libs-4.10.16-9.56.amzn1.i686
    samba-common-tools-4.10.16-9.56.amzn1.i686
    libwbclient-devel-4.10.16-9.56.amzn1.i686
    samba-winbind-clients-4.10.16-9.56.amzn1.i686
    ctdb-tests-4.10.16-9.56.amzn1.i686
    samba-winbind-krb5-locator-4.10.16-9.56.amzn1.i686
    samba-test-4.10.16-9.56.amzn1.i686

noarch:
    samba-pidl-4.10.16-9.56.amzn1.noarch
    samba-common-4.10.16-9.56.amzn1.noarch

src:
    samba-4.10.16-9.56.amzn1.src

x86_64:
    samba-winbind-modules-4.10.16-9.56.amzn1.x86_64
    libwbclient-devel-4.10.16-9.56.amzn1.x86_64
    samba-4.10.16-9.56.amzn1.x86_64
    samba-client-4.10.16-9.56.amzn1.x86_64
    samba-common-tools-4.10.16-9.56.amzn1.x86_64
    samba-client-libs-4.10.16-9.56.amzn1.x86_64
    libwbclient-4.10.16-9.56.amzn1.x86_64
    samba-test-4.10.16-9.56.amzn1.x86_64
    samba-python-4.10.16-9.56.amzn1.x86_64
    ctdb-4.10.16-9.56.amzn1.x86_64
    samba-winbind-clients-4.10.16-9.56.amzn1.x86_64
    samba-devel-4.10.16-9.56.amzn1.x86_64
    libsmbclient-4.10.16-9.56.amzn1.x86_64
    samba-krb5-printing-4.10.16-9.56.amzn1.x86_64
    samba-libs-4.10.16-9.56.amzn1.x86_64
    samba-winbind-4.10.16-9.56.amzn1.x86_64
    samba-test-libs-4.10.16-9.56.amzn1.x86_64
    samba-winbind-krb5-locator-4.10.16-9.56.amzn1.x86_64
    libsmbclient-devel-4.10.16-9.56.amzn1.x86_64
    samba-python-test-4.10.16-9.56.amzn1.x86_64
    samba-debuginfo-4.10.16-9.56.amzn1.x86_64
    samba-common-libs-4.10.16-9.56.amzn1.x86_64
    ctdb-tests-4.10.16-9.56.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions


CPE2.3 External links

http://alas.aws.amazon.com/ALAS-2021-1469.html

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

3) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU45628

Risk: High

CVSSv3.1:

CVE-ID: CVE-2020-1472

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to application does not properly impose security restrictions in Netlogon. A remote non-authenticated attacker can use MS-NRPC to connect to a domain controller to obtain domain administrator access. This vulnerability was dubbed ZeroLogon.

Mitigation

Update the affected packages:

i686:
    samba-client-4.10.16-9.56.amzn1.i686
    samba-libs-4.10.16-9.56.amzn1.i686
    samba-common-libs-4.10.16-9.56.amzn1.i686
    ctdb-4.10.16-9.56.amzn1.i686
    libwbclient-4.10.16-9.56.amzn1.i686
    samba-client-libs-4.10.16-9.56.amzn1.i686
    samba-debuginfo-4.10.16-9.56.amzn1.i686
    libsmbclient-devel-4.10.16-9.56.amzn1.i686
    samba-winbind-modules-4.10.16-9.56.amzn1.i686
    samba-python-test-4.10.16-9.56.amzn1.i686
    samba-krb5-printing-4.10.16-9.56.amzn1.i686
    samba-devel-4.10.16-9.56.amzn1.i686
    libsmbclient-4.10.16-9.56.amzn1.i686
    samba-python-4.10.16-9.56.amzn1.i686
    samba-4.10.16-9.56.amzn1.i686
    samba-winbind-4.10.16-9.56.amzn1.i686
    samba-test-libs-4.10.16-9.56.amzn1.i686
    samba-common-tools-4.10.16-9.56.amzn1.i686
    libwbclient-devel-4.10.16-9.56.amzn1.i686
    samba-winbind-clients-4.10.16-9.56.amzn1.i686
    ctdb-tests-4.10.16-9.56.amzn1.i686
    samba-winbind-krb5-locator-4.10.16-9.56.amzn1.i686
    samba-test-4.10.16-9.56.amzn1.i686

noarch:
    samba-pidl-4.10.16-9.56.amzn1.noarch
    samba-common-4.10.16-9.56.amzn1.noarch

src:
    samba-4.10.16-9.56.amzn1.src

x86_64:
    samba-winbind-modules-4.10.16-9.56.amzn1.x86_64
    libwbclient-devel-4.10.16-9.56.amzn1.x86_64
    samba-4.10.16-9.56.amzn1.x86_64
    samba-client-4.10.16-9.56.amzn1.x86_64
    samba-common-tools-4.10.16-9.56.amzn1.x86_64
    samba-client-libs-4.10.16-9.56.amzn1.x86_64
    libwbclient-4.10.16-9.56.amzn1.x86_64
    samba-test-4.10.16-9.56.amzn1.x86_64
    samba-python-4.10.16-9.56.amzn1.x86_64
    ctdb-4.10.16-9.56.amzn1.x86_64
    samba-winbind-clients-4.10.16-9.56.amzn1.x86_64
    samba-devel-4.10.16-9.56.amzn1.x86_64
    libsmbclient-4.10.16-9.56.amzn1.x86_64
    samba-krb5-printing-4.10.16-9.56.amzn1.x86_64
    samba-libs-4.10.16-9.56.amzn1.x86_64
    samba-winbind-4.10.16-9.56.amzn1.x86_64
    samba-test-libs-4.10.16-9.56.amzn1.x86_64
    samba-winbind-krb5-locator-4.10.16-9.56.amzn1.x86_64
    libsmbclient-devel-4.10.16-9.56.amzn1.x86_64
    samba-python-test-4.10.16-9.56.amzn1.x86_64
    samba-debuginfo-4.10.16-9.56.amzn1.x86_64
    samba-common-libs-4.10.16-9.56.amzn1.x86_64
    ctdb-tests-4.10.16-9.56.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions


CPE2.3 External links

http://alas.aws.amazon.com/ALAS-2021-1469.html

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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