Denial of service in Digium Asterisk

1) Improper input validation

EUVDB-ID: #VU9736

Risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/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-2017-17850

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote authenticated attacker to cause DoS condition on the target system.

The vulnerability exists due to an error when processing malicious SIP data. A remote attacker can send specially crafted SIP data without a contact header, trigger an error in the PJSIP channel driver and cause the service to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation

The vulnerability is addressed in the following version.

Vulnerable software versions

Asterisk Open Source: 13.0.0 - 15.1.4

CPE2.3

• cpe:2.3:a:digium_linux_support_services:asterisk:*:*:*:*:*:*:*:*
• cpe:2.3:a:digium_linux_support_services:asterisk:13.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:digium_linux_support_services:asterisk:13.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:digium_linux_support_services:asterisk:13.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:digium_linux_support_services:asterisk:13.3.0:*:*:*:*:*:*:*
• cpe:2.3:a:digium_linux_support_services:asterisk:13.3.1:*:*:*:*:*:*:*
• cpe:2.3:a:digium_linux_support_services:asterisk:13.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:digium_linux_support_services:asterisk:13.5.0:*:*:*:*:*:*:*
• cpe:2.3:a:digium_linux_support_services:asterisk:13.6.0:*:*:*:*:*:*:*
• cpe:2.3:a:digium_linux_support_services:asterisk:13.7.0:*:*:*:*:*:*:*

External links

https://downloads.asterisk.org/pub/security/AST-2017-014.html

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.