Multiple vulnerabilities in Samba



Risk High
Patch available YES
Number of vulnerabilities 5
CVE-ID CVE-2018-10858
CVE-2018-10918
CVE-2018-10919
CVE-2018-1139
CVE-2018-1140
CWE-ID CWE-122
CWE-476
CWE-284
CWE-327
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Samba
Server applications / Directory software, identity management

Vendor Samba

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

1) 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 to version 4.6.16, 4.7.9, or 4.8.4.

Vulnerable software versions

Samba: 3.2.0 - 4.8.3

CPE2.3 External links

https://www.samba.org/samba/security/CVE-2018-10858.html


Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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

2) NULL pointer dereference

EUVDB-ID: #VU14334

Risk: Low

CVSSv4.0: 4.6 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-10918

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause denial of service attack.

The vulnerability exists due to a NULL pointer deference error when processing directory attributes from the LDB database layer within the DsCrackNames() function in DRSUAPI RPC server. A remote authenticated attacker can send a specially crafted request to the vulnerable samba server, trigger NULL pointer dereference error and crash the affected server.

Successful exploitation of the vulnerability requires that the Samba is configured as an Active Directory Domain Controller.

Mitigation

Update to version 4.7.9 or 4.8.4.

Vulnerable software versions

Samba: 4.7.0 - 4.8.3

CPE2.3 External links

https://www.samba.org/samba/security/CVE-2018-10918.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).

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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

3) Information disclosure

EUVDB-ID: #VU14335

Risk: Low

CVSSv4.0: 4.6 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-10919

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to missing access control checks when displaying values of confidential attributes. A remote authenticated attacker can use LDAP search expression to  obtain both of attributes where the schema SEARCH_FLAG_CONFIDENTIAL (0x80) searchFlags bit and where an explicit Access Control Entry has been specified on the ntSecurityDescriptor.

Mitigation

Update to version 4.6.16, 4.7.9 or 4.8.4.

Vulnerable software versions

Samba: 4.0.0 - 4.8.3

CPE2.3 External links

https://www.samba.org/samba/security/CVE-2018-10919.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).

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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

4) 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 to version 4.7.9 or 4.8.4.

Vulnerable software versions

Samba: 4.7.0 - 4.8.3

CPE2.3 External links

https://www.samba.org/samba/security/CVE-2018-1139.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).

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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

5) NULL pointer dereference

EUVDB-ID: #VU14337

Risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-1140

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause denial of service attack.
The vulnerability exists due to improper input validation when processing data from the LDB database layer. A remote attacker can trigger NULL pointer dereference error and cause the LDAP server and DNS server to crash.


Mitigation

Update to version 4.8.4.

Vulnerable software versions

Samba: 4.8.0 - 4.8.3

CPE2.3 External links

https://www.samba.org/samba/security/CVE-2018-1140.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).

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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



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