Multiple vulnerabilities in OpenSSH
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 5 |
| CVE-ID | CVE-2016-10012 CVE-2016-10011 CVE-2016-10010 CVE-2016-10009 |
| CWE-ID | CWE-264 CWE-119 CWE-20 |
| Exploitation vector | Network |
| Public exploit |
Public exploit code for vulnerability #4 is available. Public exploit code for vulnerability #5 is available. |
| Vulnerable software Subscribe |
OpenSSH Server applications / Remote management servers, RDP, SSH |
| Vendor | OpenSSH |
Security Bulletin
This security bulletin contains information about 5 vulnerabilities.
1) Improper input validation
EUVDB-ID: #VU2088
Risk: Low
CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: N/A
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass certain security restrictions.
The vulnerability exists due to an error in sshd, which can be used to bypass address-based access controls if the AllowUser directive is configured with invalid CIDR address ranges.
Successful exploitation of this vulnerability may allow a remote attacker to bypass implemented access control mechanisms and perform a further attacks against vulnerable system.
Install the latest version of OpenSSH 7.4.
OpenSSH: 7.3p1
External linkshttp://www.openssh.com/txt/release-7.4
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) Buffer overflow
EUVDB-ID: #VU2075
Risk: Low
CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2016-10012
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
DescriptionThe vulnerability allows a local user to execute arbitrary code on vulnerable system with root privileges.
The vulnerability exists in sshd due to a flaw in boundary checks in the shared memory manager that may be skipped by some optimizing compilers. A local user can trigger memory corruption and execute arbitrary code with root privileges. The issue is related to m_zback and m_zlib data structures.
Successful exploitation of this vulnerability may allow a local user to elevate privileges.
Install the latest version of OpenSSH 7.4.
OpenSSH: 7.3p1
External linkshttp://www.openssh.com/txt/release-7.4
http://github.com/openbsd/src/commit/3095060f479b86288e31c79ecbc5131a66bcd2f9
http://www.openwall.com/lists/oss-security/2016/12/19/2
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
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.
The attacker would have to login to the system and perform certain actions 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: #VU2068
Risk: Low
CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2016-10011
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to an error in authfile.c, which may allow a local authenticated user to obtain host private key material.
Successful exploitation of this vulnerability may allow a local user to gain access to otherwise restricted information.
Install the latest version of OpenSSH 7.4.
OpenSSH: 7.3p1
External linkshttp://www.openssh.com/txt/release-7.4
http://www.openwall.com/lists/oss-security/2016/12/19/2
http://github.com/openbsd/src/commit/ac8147a06ed2e2403fb6b9a0c03e618a9333c0e9
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
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.
The attacker would have to login to the system and perform certain actions 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) Privilege escalation
EUVDB-ID: #VU2053
Risk: Low
CVSSv3.1: 7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2016-10010
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: Yes
DescriptionThe vulnerability allows a local user to execute arbitrary code on vulnerable system with root privileges.
The vulnerability exists due to an error in sshd in serverloop.c, which may allow a local authenticated user to execute arbitrary code with root privileges via a forwarded Unix-domain socket.
Successful exploitation of this vulnerability may allow a local user to elevate privileges.
Install the latest version of OpenSSH 7.4.
OpenSSH: 7.3p1
External linkshttp://www.openssh.com/txt/release-7.4
http://www.openwall.com/lists/oss-security/2016/12/19/2
http://github.com/openbsd/src/commit/c76fac666ea038753294f2ac94d310f8adece9ce
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
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.
The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
5) Improper input validation
EUVDB-ID: #VU2015
Risk: Low
CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2016-10009
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on vulnerable ssh client.
The vulnerability exists due to incorrect handling of data passed to PKCS#11 module within ssh-agent. A remote attacker with control over sshd service can execute arbitrary code on vulnerable client.
Successful exploitation of this vulnerability may allow a remote attacker to execute arbitrary code on vulnerable client system but requires that client is connected to malicious SSH server.
Install the latest version of OpenSSH 7.4.
OpenSSH: 7.3p1
External linkshttp://www.openssh.com/txt/release-7.4
http://www.openwall.com/lists/oss-security/2016/12/19/2
http://github.com/openbsd/src/commit/9476ce1dd37d3c3218d5640b74c34c65e5f4efe5
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. However, proof of concept for this vulnerability is available.
