Multiple vulnerabilities in Samba
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2016-2125 CVE-2016-2126 CVE-2016-2123 |
| CWE-ID | CWE-287 CWE-119 CWE-191 |
| Exploitation vector | Local network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Samba Server applications / Directory software, identity management |
| Vendor | Samba |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Improper authentication
EUVDB-ID: #VU6628
Risk: Low
CVSSv3.1: 5.5 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]
CVE-ID: CVE-2016-2125
CWE-ID:
CWE-287 - Improper Authentication
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker on the local network to bypass Kerberos authentication.
The vulnerability exists due to design error when implementing Kerberos authentication. An attacker with access to local network can place a fake Samba server, intercept a valid general purpose Kerberos "Ticket Granting Ticket" (TGT) and fully impersonate the authenticated user or service.
Successful exploitation of the vulnerability may allow an attacker to bypass authentication process and gain access to otherwise restricted resources and services.
The vulnerability is patched in versions 4.5.3, 4.4.8 and 4.3.13.
Vulnerable software versionsSamba: 3.0.25 - 4.5.2
External linkshttp://www.samba.org/samba/security/CVE-2016-2125.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.
2) Buffer overflow
EUVDB-ID: #VU6629
Risk: Medium
CVSSv3.1: 4.8 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]
CVE-ID: CVE-2016-2126
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
DescriptionThe vulnerability allows a remote authenticated attacker to escalate privileges.
The vulnerability exists due to a boundary error within Kerberos PAC validation process in winbindd. A remote authenticated attacker can send a specially crafted request to vulnerable Samba server, trigger buffer overflow and execute arbitrary code on the server with elevated privileges.
Successful exploitation of the vulnerability may allow an attacker to execute arbitrary code with elevated privileges.
The vulnerability is fixed in the following versions: 4.5.3, 4.4.8 and 4.3.13.
Samba: 4.0.0 - 4.5.2
External linkshttp://www.samba.org/samba/security/CVE-2016-2126.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) Integer underflow
EUVDB-ID: #VU6632
Risk: Medium
CVSSv3.1: 7.8 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2016-2123
CWE-ID:
CWE-191 - Integer underflow
Exploit availability: No
DescriptionThe vulnerability allows a remote authenticated user to compromise vulnerable server.
The vulnerability exists due to integer underflow within ndr_pull_dnsp_name routine when processing dnsRecord attribute in LDAP requests. A remote authenticated attacker can send a specially crafted LDAP request to the affected server, trigger heap-based buffer overflow and execute arbitrary code on the target sever.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable server.
The vulnerability is patched in versions: 4.5.3, 4.4.8 and 4.3.13.
Samba: 4.0.0 - 4.5.2
External linkshttp://www.samba.org/samba/security/CVE-2016-2123.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.
