Amazon Linux AMI update for samba



Risk Medium
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2018-1050
CVE-2018-1139
CVE-2018-10858
CWE-ID CWE-20
CWE-327
CWE-122
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Amazon Linux AMI
Operating systems & Components / Operating system

Vendor Amazon Web Services

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Improper input validation

EUVDB-ID: #VU10949

Risk: Low

CVSSv4.0: 2.3 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-1050

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to improper input validation when processing RPC requests to the spoolss service. A remote attacker can send a specially crafted RPC request to the affected service and trigger denial of service conditions.

Successful exploitation of the vulnerability requires that the RPC spoolss service services is configured as external daemon.

Mitigation

Update the affected packages.

i686:
    samba-python-test-4.8.3-4.amzn1.i686
    libsmbclient-4.8.3-4.amzn1.i686
    samba-libs-4.8.3-4.amzn1.i686
    samba-devel-4.8.3-4.amzn1.i686
    samba-test-libs-4.8.3-4.amzn1.i686
    samba-winbind-krb5-locator-4.8.3-4.amzn1.i686
    samba-winbind-clients-4.8.3-4.amzn1.i686
    samba-common-tools-4.8.3-4.amzn1.i686
    ctdb-4.8.3-4.amzn1.i686
    samba-winbind-modules-4.8.3-4.amzn1.i686
    libsmbclient-devel-4.8.3-4.amzn1.i686
    samba-krb5-printing-4.8.3-4.amzn1.i686
    samba-debuginfo-4.8.3-4.amzn1.i686
    samba-4.8.3-4.amzn1.i686
    samba-python-4.8.3-4.amzn1.i686
    ctdb-tests-4.8.3-4.amzn1.i686
    samba-test-4.8.3-4.amzn1.i686
    libwbclient-devel-4.8.3-4.amzn1.i686
    samba-client-libs-4.8.3-4.amzn1.i686
    samba-winbind-4.8.3-4.amzn1.i686
    samba-common-libs-4.8.3-4.amzn1.i686
    libwbclient-4.8.3-4.amzn1.i686
    samba-client-4.8.3-4.amzn1.i686

noarch:
    samba-common-4.8.3-4.amzn1.noarch
    samba-pidl-4.8.3-4.amzn1.noarch

src:
    samba-4.8.3-4.amzn1.src

x86_64:
    samba-winbind-krb5-locator-4.8.3-4.amzn1.x86_64
    samba-test-libs-4.8.3-4.amzn1.x86_64
    samba-winbind-clients-4.8.3-4.amzn1.x86_64
    samba-winbind-4.8.3-4.amzn1.x86_64
    libsmbclient-4.8.3-4.amzn1.x86_64
    samba-python-test-4.8.3-4.amzn1.x86_64
    samba-python-4.8.3-4.amzn1.x86_64
    samba-devel-4.8.3-4.amzn1.x86_64
    libwbclient-devel-4.8.3-4.amzn1.x86_64
    samba-debuginfo-4.8.3-4.amzn1.x86_64
    samba-krb5-printing-4.8.3-4.amzn1.x86_64
    libwbclient-4.8.3-4.amzn1.x86_64
    samba-common-libs-4.8.3-4.amzn1.x86_64
    ctdb-tests-4.8.3-4.amzn1.x86_64
    samba-client-libs-4.8.3-4.amzn1.x86_64
    samba-client-4.8.3-4.amzn1.x86_64
    libsmbclient-devel-4.8.3-4.amzn1.x86_64
    ctdb-4.8.3-4.amzn1.x86_64
    samba-test-4.8.3-4.amzn1.x86_64
    samba-4.8.3-4.amzn1.x86_64
    samba-winbind-modules-4.8.3-4.amzn1.x86_64
    samba-libs-4.8.3-4.amzn1.x86_64
    samba-common-tools-4.8.3-4.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2018-1126.html


Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

2) Weakn encryption

EUVDB-ID: #VU14336

Risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-1139

CWE-ID: CWE-327 - Use of a Broken or Risky Cryptographic Algorithm

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to an error that allows usage of NTLMv1 encryption protocol over SMB1 transport, even when NTLMv1 is explicitly disabled.

Mitigation

Update the affected packages.

i686:
    samba-python-test-4.8.3-4.amzn1.i686
    libsmbclient-4.8.3-4.amzn1.i686
    samba-libs-4.8.3-4.amzn1.i686
    samba-devel-4.8.3-4.amzn1.i686
    samba-test-libs-4.8.3-4.amzn1.i686
    samba-winbind-krb5-locator-4.8.3-4.amzn1.i686
    samba-winbind-clients-4.8.3-4.amzn1.i686
    samba-common-tools-4.8.3-4.amzn1.i686
    ctdb-4.8.3-4.amzn1.i686
    samba-winbind-modules-4.8.3-4.amzn1.i686
    libsmbclient-devel-4.8.3-4.amzn1.i686
    samba-krb5-printing-4.8.3-4.amzn1.i686
    samba-debuginfo-4.8.3-4.amzn1.i686
    samba-4.8.3-4.amzn1.i686
    samba-python-4.8.3-4.amzn1.i686
    ctdb-tests-4.8.3-4.amzn1.i686
    samba-test-4.8.3-4.amzn1.i686
    libwbclient-devel-4.8.3-4.amzn1.i686
    samba-client-libs-4.8.3-4.amzn1.i686
    samba-winbind-4.8.3-4.amzn1.i686
    samba-common-libs-4.8.3-4.amzn1.i686
    libwbclient-4.8.3-4.amzn1.i686
    samba-client-4.8.3-4.amzn1.i686

noarch:
    samba-common-4.8.3-4.amzn1.noarch
    samba-pidl-4.8.3-4.amzn1.noarch

src:
    samba-4.8.3-4.amzn1.src

x86_64:
    samba-winbind-krb5-locator-4.8.3-4.amzn1.x86_64
    samba-test-libs-4.8.3-4.amzn1.x86_64
    samba-winbind-clients-4.8.3-4.amzn1.x86_64
    samba-winbind-4.8.3-4.amzn1.x86_64
    libsmbclient-4.8.3-4.amzn1.x86_64
    samba-python-test-4.8.3-4.amzn1.x86_64
    samba-python-4.8.3-4.amzn1.x86_64
    samba-devel-4.8.3-4.amzn1.x86_64
    libwbclient-devel-4.8.3-4.amzn1.x86_64
    samba-debuginfo-4.8.3-4.amzn1.x86_64
    samba-krb5-printing-4.8.3-4.amzn1.x86_64
    libwbclient-4.8.3-4.amzn1.x86_64
    samba-common-libs-4.8.3-4.amzn1.x86_64
    ctdb-tests-4.8.3-4.amzn1.x86_64
    samba-client-libs-4.8.3-4.amzn1.x86_64
    samba-client-4.8.3-4.amzn1.x86_64
    libsmbclient-devel-4.8.3-4.amzn1.x86_64
    ctdb-4.8.3-4.amzn1.x86_64
    samba-test-4.8.3-4.amzn1.x86_64
    samba-4.8.3-4.amzn1.x86_64
    samba-winbind-modules-4.8.3-4.amzn1.x86_64
    samba-libs-4.8.3-4.amzn1.x86_64
    samba-common-tools-4.8.3-4.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2018-1126.html


Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

3) Heap-based buffer overflow

EUVDB-ID: #VU14333

Risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2018-10858

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in libsmbclientwhen processing a list of directory entries, received from the server. A remote attacker can trick the victim to connect to a malicious SMB server, send a long list of directory entries, trigger heap-based buffer overflow and crash the client or execute arbitrary code on the target system.

Mitigation

Update the affected packages.

i686:
    samba-python-test-4.8.3-4.amzn1.i686
    libsmbclient-4.8.3-4.amzn1.i686
    samba-libs-4.8.3-4.amzn1.i686
    samba-devel-4.8.3-4.amzn1.i686
    samba-test-libs-4.8.3-4.amzn1.i686
    samba-winbind-krb5-locator-4.8.3-4.amzn1.i686
    samba-winbind-clients-4.8.3-4.amzn1.i686
    samba-common-tools-4.8.3-4.amzn1.i686
    ctdb-4.8.3-4.amzn1.i686
    samba-winbind-modules-4.8.3-4.amzn1.i686
    libsmbclient-devel-4.8.3-4.amzn1.i686
    samba-krb5-printing-4.8.3-4.amzn1.i686
    samba-debuginfo-4.8.3-4.amzn1.i686
    samba-4.8.3-4.amzn1.i686
    samba-python-4.8.3-4.amzn1.i686
    ctdb-tests-4.8.3-4.amzn1.i686
    samba-test-4.8.3-4.amzn1.i686
    libwbclient-devel-4.8.3-4.amzn1.i686
    samba-client-libs-4.8.3-4.amzn1.i686
    samba-winbind-4.8.3-4.amzn1.i686
    samba-common-libs-4.8.3-4.amzn1.i686
    libwbclient-4.8.3-4.amzn1.i686
    samba-client-4.8.3-4.amzn1.i686

noarch:
    samba-common-4.8.3-4.amzn1.noarch
    samba-pidl-4.8.3-4.amzn1.noarch

src:
    samba-4.8.3-4.amzn1.src

x86_64:
    samba-winbind-krb5-locator-4.8.3-4.amzn1.x86_64
    samba-test-libs-4.8.3-4.amzn1.x86_64
    samba-winbind-clients-4.8.3-4.amzn1.x86_64
    samba-winbind-4.8.3-4.amzn1.x86_64
    libsmbclient-4.8.3-4.amzn1.x86_64
    samba-python-test-4.8.3-4.amzn1.x86_64
    samba-python-4.8.3-4.amzn1.x86_64
    samba-devel-4.8.3-4.amzn1.x86_64
    libwbclient-devel-4.8.3-4.amzn1.x86_64
    samba-debuginfo-4.8.3-4.amzn1.x86_64
    samba-krb5-printing-4.8.3-4.amzn1.x86_64
    libwbclient-4.8.3-4.amzn1.x86_64
    samba-common-libs-4.8.3-4.amzn1.x86_64
    ctdb-tests-4.8.3-4.amzn1.x86_64
    samba-client-libs-4.8.3-4.amzn1.x86_64
    samba-client-4.8.3-4.amzn1.x86_64
    libsmbclient-devel-4.8.3-4.amzn1.x86_64
    ctdb-4.8.3-4.amzn1.x86_64
    samba-test-4.8.3-4.amzn1.x86_64
    samba-4.8.3-4.amzn1.x86_64
    samba-winbind-modules-4.8.3-4.amzn1.x86_64
    samba-libs-4.8.3-4.amzn1.x86_64
    samba-common-tools-4.8.3-4.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2018-1126.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.



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