Amazon Linux AMI update for samba

Published: 2022-02-19 | Updated: 2022-09-22

Risk	High
Patch available	YES
Number of vulnerabilities	4
CVE-ID	CVE-2016-2124 CVE-2020-25717 CVE-2021-20254 CVE-2021-44142
CWE-ID	CWE-284 CWE-264 CWE-125 CWE-787
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #4 is available.
Vulnerable software Subscribe	Amazon Linux AMI Operating systems & Components / Operating system
Vendor	Amazon Web Services

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Improper access control

EUVDB-ID: #VU58098

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-2124

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to SMB1 client connections can be downgraded to plaintext authentication. A remote attacker can perform a man-in-the-middle attack and downgrade a negotiated SMB1 client connection and its capabitilities.

Mitigation

Update the affected packages:

i686:
    ctdb-tests-4.10.16-18.59.amzn1.i686
    libwbclient-4.10.16-18.59.amzn1.i686
    samba-python-4.10.16-18.59.amzn1.i686
    ctdb-4.10.16-18.59.amzn1.i686
    samba-client-libs-4.10.16-18.59.amzn1.i686
    samba-common-libs-4.10.16-18.59.amzn1.i686
    samba-winbind-clients-4.10.16-18.59.amzn1.i686
    libwbclient-devel-4.10.16-18.59.amzn1.i686
    samba-devel-4.10.16-18.59.amzn1.i686
    libsmbclient-devel-4.10.16-18.59.amzn1.i686
    samba-test-libs-4.10.16-18.59.amzn1.i686
    samba-test-4.10.16-18.59.amzn1.i686
    samba-debuginfo-4.10.16-18.59.amzn1.i686
    samba-4.10.16-18.59.amzn1.i686
    samba-winbind-modules-4.10.16-18.59.amzn1.i686
    samba-winbind-krb5-locator-4.10.16-18.59.amzn1.i686
    libsmbclient-4.10.16-18.59.amzn1.i686
    samba-winbind-4.10.16-18.59.amzn1.i686
    samba-common-tools-4.10.16-18.59.amzn1.i686
    samba-libs-4.10.16-18.59.amzn1.i686
    samba-krb5-printing-4.10.16-18.59.amzn1.i686
    samba-client-4.10.16-18.59.amzn1.i686
    samba-python-test-4.10.16-18.59.amzn1.i686

noarch:
    samba-pidl-4.10.16-18.59.amzn1.noarch
    samba-common-4.10.16-18.59.amzn1.noarch

src:
    samba-4.10.16-18.59.amzn1.src

x86_64:
    samba-4.10.16-18.59.amzn1.x86_64
    samba-winbind-clients-4.10.16-18.59.amzn1.x86_64
    libsmbclient-4.10.16-18.59.amzn1.x86_64
    libwbclient-devel-4.10.16-18.59.amzn1.x86_64
    libsmbclient-devel-4.10.16-18.59.amzn1.x86_64
    samba-winbind-4.10.16-18.59.amzn1.x86_64
    samba-test-libs-4.10.16-18.59.amzn1.x86_64
    samba-winbind-krb5-locator-4.10.16-18.59.amzn1.x86_64
    samba-python-test-4.10.16-18.59.amzn1.x86_64
    samba-debuginfo-4.10.16-18.59.amzn1.x86_64
    libwbclient-4.10.16-18.59.amzn1.x86_64
    ctdb-4.10.16-18.59.amzn1.x86_64
    samba-client-4.10.16-18.59.amzn1.x86_64
    samba-devel-4.10.16-18.59.amzn1.x86_64
    samba-test-4.10.16-18.59.amzn1.x86_64
    samba-krb5-printing-4.10.16-18.59.amzn1.x86_64
    samba-client-libs-4.10.16-18.59.amzn1.x86_64
    samba-libs-4.10.16-18.59.amzn1.x86_64
    samba-winbind-modules-4.10.16-18.59.amzn1.x86_64
    samba-python-4.10.16-18.59.amzn1.x86_64
    samba-common-libs-4.10.16-18.59.amzn1.x86_64
    ctdb-tests-4.10.16-18.59.amzn1.x86_64
    samba-common-tools-4.10.16-18.59.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:

External links

http://alas.aws.amazon.com/ALAS-2022-1564.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU58097

Risk: Medium

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-25717

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

Exploit availability: No

Description

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

The vulnerability exists due to the Windows Active Directory (AD) domains have by default a feature to allow users to create computer accounts. A remote authenticated attacker can create such account with elevated privileges on the system.

Mitigation

Update the affected packages:

i686:
    ctdb-tests-4.10.16-18.59.amzn1.i686
    libwbclient-4.10.16-18.59.amzn1.i686
    samba-python-4.10.16-18.59.amzn1.i686
    ctdb-4.10.16-18.59.amzn1.i686
    samba-client-libs-4.10.16-18.59.amzn1.i686
    samba-common-libs-4.10.16-18.59.amzn1.i686
    samba-winbind-clients-4.10.16-18.59.amzn1.i686
    libwbclient-devel-4.10.16-18.59.amzn1.i686
    samba-devel-4.10.16-18.59.amzn1.i686
    libsmbclient-devel-4.10.16-18.59.amzn1.i686
    samba-test-libs-4.10.16-18.59.amzn1.i686
    samba-test-4.10.16-18.59.amzn1.i686
    samba-debuginfo-4.10.16-18.59.amzn1.i686
    samba-4.10.16-18.59.amzn1.i686
    samba-winbind-modules-4.10.16-18.59.amzn1.i686
    samba-winbind-krb5-locator-4.10.16-18.59.amzn1.i686
    libsmbclient-4.10.16-18.59.amzn1.i686
    samba-winbind-4.10.16-18.59.amzn1.i686
    samba-common-tools-4.10.16-18.59.amzn1.i686
    samba-libs-4.10.16-18.59.amzn1.i686
    samba-krb5-printing-4.10.16-18.59.amzn1.i686
    samba-client-4.10.16-18.59.amzn1.i686
    samba-python-test-4.10.16-18.59.amzn1.i686

noarch:
    samba-pidl-4.10.16-18.59.amzn1.noarch
    samba-common-4.10.16-18.59.amzn1.noarch

src:
    samba-4.10.16-18.59.amzn1.src

x86_64:
    samba-4.10.16-18.59.amzn1.x86_64
    samba-winbind-clients-4.10.16-18.59.amzn1.x86_64
    libsmbclient-4.10.16-18.59.amzn1.x86_64
    libwbclient-devel-4.10.16-18.59.amzn1.x86_64
    libsmbclient-devel-4.10.16-18.59.amzn1.x86_64
    samba-winbind-4.10.16-18.59.amzn1.x86_64
    samba-test-libs-4.10.16-18.59.amzn1.x86_64
    samba-winbind-krb5-locator-4.10.16-18.59.amzn1.x86_64
    samba-python-test-4.10.16-18.59.amzn1.x86_64
    samba-debuginfo-4.10.16-18.59.amzn1.x86_64
    libwbclient-4.10.16-18.59.amzn1.x86_64
    ctdb-4.10.16-18.59.amzn1.x86_64
    samba-client-4.10.16-18.59.amzn1.x86_64
    samba-devel-4.10.16-18.59.amzn1.x86_64
    samba-test-4.10.16-18.59.amzn1.x86_64
    samba-krb5-printing-4.10.16-18.59.amzn1.x86_64
    samba-client-libs-4.10.16-18.59.amzn1.x86_64
    samba-libs-4.10.16-18.59.amzn1.x86_64
    samba-winbind-modules-4.10.16-18.59.amzn1.x86_64
    samba-python-4.10.16-18.59.amzn1.x86_64
    samba-common-libs-4.10.16-18.59.amzn1.x86_64
    ctdb-tests-4.10.16-18.59.amzn1.x86_64
    samba-common-tools-4.10.16-18.59.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:

External links

http://alas.aws.amazon.com/ALAS-2022-1564.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Out-of-bounds read

EUVDB-ID: #VU52748

Risk: Medium

CVSSv3.1: 4 [CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20254

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

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

The vulnerability exists due to a boundary condition when mapping Windows group identities (SIDs) into unix group identities (gids), which resulted into negative idmap cache entries created in the Samba server process token. An attacker who can manage to trigger the vulnerability can crash the Samba server or potentially perform unauthorized actions on the system.

Mitigation

Update the affected packages:

i686:
    ctdb-tests-4.10.16-18.59.amzn1.i686
    libwbclient-4.10.16-18.59.amzn1.i686
    samba-python-4.10.16-18.59.amzn1.i686
    ctdb-4.10.16-18.59.amzn1.i686
    samba-client-libs-4.10.16-18.59.amzn1.i686
    samba-common-libs-4.10.16-18.59.amzn1.i686
    samba-winbind-clients-4.10.16-18.59.amzn1.i686
    libwbclient-devel-4.10.16-18.59.amzn1.i686
    samba-devel-4.10.16-18.59.amzn1.i686
    libsmbclient-devel-4.10.16-18.59.amzn1.i686
    samba-test-libs-4.10.16-18.59.amzn1.i686
    samba-test-4.10.16-18.59.amzn1.i686
    samba-debuginfo-4.10.16-18.59.amzn1.i686
    samba-4.10.16-18.59.amzn1.i686
    samba-winbind-modules-4.10.16-18.59.amzn1.i686
    samba-winbind-krb5-locator-4.10.16-18.59.amzn1.i686
    libsmbclient-4.10.16-18.59.amzn1.i686
    samba-winbind-4.10.16-18.59.amzn1.i686
    samba-common-tools-4.10.16-18.59.amzn1.i686
    samba-libs-4.10.16-18.59.amzn1.i686
    samba-krb5-printing-4.10.16-18.59.amzn1.i686
    samba-client-4.10.16-18.59.amzn1.i686
    samba-python-test-4.10.16-18.59.amzn1.i686

noarch:
    samba-pidl-4.10.16-18.59.amzn1.noarch
    samba-common-4.10.16-18.59.amzn1.noarch

src:
    samba-4.10.16-18.59.amzn1.src

x86_64:
    samba-4.10.16-18.59.amzn1.x86_64
    samba-winbind-clients-4.10.16-18.59.amzn1.x86_64
    libsmbclient-4.10.16-18.59.amzn1.x86_64
    libwbclient-devel-4.10.16-18.59.amzn1.x86_64
    libsmbclient-devel-4.10.16-18.59.amzn1.x86_64
    samba-winbind-4.10.16-18.59.amzn1.x86_64
    samba-test-libs-4.10.16-18.59.amzn1.x86_64
    samba-winbind-krb5-locator-4.10.16-18.59.amzn1.x86_64
    samba-python-test-4.10.16-18.59.amzn1.x86_64
    samba-debuginfo-4.10.16-18.59.amzn1.x86_64
    libwbclient-4.10.16-18.59.amzn1.x86_64
    ctdb-4.10.16-18.59.amzn1.x86_64
    samba-client-4.10.16-18.59.amzn1.x86_64
    samba-devel-4.10.16-18.59.amzn1.x86_64
    samba-test-4.10.16-18.59.amzn1.x86_64
    samba-krb5-printing-4.10.16-18.59.amzn1.x86_64
    samba-client-libs-4.10.16-18.59.amzn1.x86_64
    samba-libs-4.10.16-18.59.amzn1.x86_64
    samba-winbind-modules-4.10.16-18.59.amzn1.x86_64
    samba-python-4.10.16-18.59.amzn1.x86_64
    samba-common-libs-4.10.16-18.59.amzn1.x86_64
    ctdb-tests-4.10.16-18.59.amzn1.x86_64
    samba-common-tools-4.10.16-18.59.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:

External links

http://alas.aws.amazon.com/ALAS-2022-1564.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Out-of-bounds write

EUVDB-ID: #VU60186

Risk: High

CVSSv3.1: 8.6 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-44142

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing EA metadata while opening files in smbd within the VFS Samba module (vfs_fruit). A remote attacker with ability to write to file's extended attributes can trigger an out-of-bounds write and execute arbitrary code with root privileges.

Note, the vulnerability in vfs_fruit exists in the default configuration of the fruit VFS module using fruit:metadata=netatalk or fruit:resource=file.

Mitigation

Update the affected packages:

i686:
    ctdb-tests-4.10.16-18.59.amzn1.i686
    libwbclient-4.10.16-18.59.amzn1.i686
    samba-python-4.10.16-18.59.amzn1.i686
    ctdb-4.10.16-18.59.amzn1.i686
    samba-client-libs-4.10.16-18.59.amzn1.i686
    samba-common-libs-4.10.16-18.59.amzn1.i686
    samba-winbind-clients-4.10.16-18.59.amzn1.i686
    libwbclient-devel-4.10.16-18.59.amzn1.i686
    samba-devel-4.10.16-18.59.amzn1.i686
    libsmbclient-devel-4.10.16-18.59.amzn1.i686
    samba-test-libs-4.10.16-18.59.amzn1.i686
    samba-test-4.10.16-18.59.amzn1.i686
    samba-debuginfo-4.10.16-18.59.amzn1.i686
    samba-4.10.16-18.59.amzn1.i686
    samba-winbind-modules-4.10.16-18.59.amzn1.i686
    samba-winbind-krb5-locator-4.10.16-18.59.amzn1.i686
    libsmbclient-4.10.16-18.59.amzn1.i686
    samba-winbind-4.10.16-18.59.amzn1.i686
    samba-common-tools-4.10.16-18.59.amzn1.i686
    samba-libs-4.10.16-18.59.amzn1.i686
    samba-krb5-printing-4.10.16-18.59.amzn1.i686
    samba-client-4.10.16-18.59.amzn1.i686
    samba-python-test-4.10.16-18.59.amzn1.i686

noarch:
    samba-pidl-4.10.16-18.59.amzn1.noarch
    samba-common-4.10.16-18.59.amzn1.noarch

src:
    samba-4.10.16-18.59.amzn1.src

x86_64:
    samba-4.10.16-18.59.amzn1.x86_64
    samba-winbind-clients-4.10.16-18.59.amzn1.x86_64
    libsmbclient-4.10.16-18.59.amzn1.x86_64
    libwbclient-devel-4.10.16-18.59.amzn1.x86_64
    libsmbclient-devel-4.10.16-18.59.amzn1.x86_64
    samba-winbind-4.10.16-18.59.amzn1.x86_64
    samba-test-libs-4.10.16-18.59.amzn1.x86_64
    samba-winbind-krb5-locator-4.10.16-18.59.amzn1.x86_64
    samba-python-test-4.10.16-18.59.amzn1.x86_64
    samba-debuginfo-4.10.16-18.59.amzn1.x86_64
    libwbclient-4.10.16-18.59.amzn1.x86_64
    ctdb-4.10.16-18.59.amzn1.x86_64
    samba-client-4.10.16-18.59.amzn1.x86_64
    samba-devel-4.10.16-18.59.amzn1.x86_64
    samba-test-4.10.16-18.59.amzn1.x86_64
    samba-krb5-printing-4.10.16-18.59.amzn1.x86_64
    samba-client-libs-4.10.16-18.59.amzn1.x86_64
    samba-libs-4.10.16-18.59.amzn1.x86_64
    samba-winbind-modules-4.10.16-18.59.amzn1.x86_64
    samba-python-4.10.16-18.59.amzn1.x86_64
    samba-common-libs-4.10.16-18.59.amzn1.x86_64
    ctdb-tests-4.10.16-18.59.amzn1.x86_64
    samba-common-tools-4.10.16-18.59.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:

External links

http://alas.aws.amazon.com/ALAS-2022-1564.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.