Ubuntu update for bind9
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2016-2775 CVE-2016-6170 |
| CWE-ID | CWE-119 CWE-233 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
Ubuntu Operating systems & Components / Operating system lwresd (Ubuntu package) Operating systems & Components / Operating system package or component bind9 (Ubuntu package) Operating systems & Components / Operating system package or component |
| Vendor | Canonical Ltd. |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Denial of service
EUVDB-ID: #VU164
Risk: Medium
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:Green]
CVE-ID: CVE-2016-2775
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to cause the target service to crash.
The vulnerability exists due to boundary error in BIND. A remote unauthenticated attacker can cause the target BIND server to crash by sending a specially crafted request with a query name and a search list entry that exceeds the maximum allowable length.
Systems using the lightweight resolution protocol via either the 'lwresd' utility or via named using the "lwres" statement in 'named.conf' are affected.
Successful exploitation of this vulnerability may result in denial of service.
Update the affected package bind9 to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 16.04
lwresd (Ubuntu package): before Ubuntu Pro (Infra-only)
bind9 (Ubuntu package): before Ubuntu Pro (Infra-only)
CPE2.3- cpe:2.3:o:canonical:ubuntu:14.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
- cpe:2.3:a:canonical:lwresd_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:bind9_ubuntu_package:*:*:*:*:*:ubuntu:*:*
https://ubuntu.com/security/notices/USN-5747-1
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.
2) AXFR/IXFR response processing flaw in BIND
EUVDB-ID: #VU103
Risk: Low
CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2016-6170
CWE-ID:
CWE-233 - Improper Handling of Parameters
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to cause the target service to crash.
The vulnerability exists due to resource error in BIND. A remote primary DNS server can cause the target secondary DNS server to crash by sending a specially crafted AXFR response or IXFR response. A remote unauthenticated attacker may be able to send a specially crafted UPDATE message to cause the target server to crash.
Successful exploitation of this vulnerability may result in denial of service.
MitigationUpdate the affected package bind9 to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 16.04
lwresd (Ubuntu package): before Ubuntu Pro (Infra-only)
bind9 (Ubuntu package): before Ubuntu Pro (Infra-only)
CPE2.3- cpe:2.3:o:canonical:ubuntu:14.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
- cpe:2.3:a:canonical:lwresd_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:bind9_ubuntu_package:*:*:*:*:*:ubuntu:*:*
https://ubuntu.com/security/notices/USN-5747-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
