Risk | Medium |
Patch available | YES |
Number of vulnerabilities | 2 |
CVE-ID | CVE-2016-10708 CVE-2018-15473 |
CWE-ID | CWE-476 CWE-388 |
Exploitation vector | Network |
Public exploit | Public exploit code for vulnerability #2 is available. |
Vulnerable software |
Ubuntu Operating systems & Components / Operating system openssh-server (Ubuntu package) Operating systems & Components / Operating system package or component |
Vendor | Canonical Ltd. |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
EUVDB-ID: #VU14163
Risk: Low
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/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-2016-10708
CWE-ID:
CWE-476 - NULL Pointer Dereference
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to cause DoS condition on the target system.
The vulnerability exists due to improper processing of out-of-sequence NEWKEYS messages, as defined in the kex.c and packet.c source code files. A remote attacker can send an out-of-sequence NEWKEYS message, trigger a NULL pointer dereference condition and cause the sshd daemon to crash.
MitigationUpdate the affected package openssh to the latest version.
Vulnerable software versionsUbuntu: 18.04
openssh-server (Ubuntu package): before 1:7.6p1-4ubuntu0.5
CPE2.3https://ubuntu.com/security/notices/USN-3809-2
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.
EUVDB-ID: #VU14440
Risk: Medium
CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:A/U:Green]
CVE-ID: CVE-2018-15473
CWE-ID:
CWE-388 - Error Handling
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to enumerate all accounts on the system.
The vulnerability exists due to a logical error in auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c files when processing authentication requests. A remote attacker can send a specially crafted chain of packets and monitor behavior of openssh server to determine presence of a valid username. The server will drop connection upon receiving a malformed authentication packets if the username is valid.
MitigationUpdate the affected package openssh to the latest version.
Vulnerable software versionsUbuntu: 18.04
openssh-server (Ubuntu package): before 1:7.6p1-4ubuntu0.5
CPE2.3 External linkshttps://ubuntu.com/security/notices/USN-3809-2
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. However, a fully functional exploit for this vulnerability is available.