Vulnerability identifier: #VU13262

Vulnerability risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Asterisk Open Source
Server applications / Conferencing, Collaboration and VoIP solutions

Vendor: Digium (Linux Support Services)

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists due to an error when the system is configured with endpoint-specific access control list (ACL) rules. A remote attacker can send a SIP request to cause the system to return a 403 Forbidden response and disclose the existence of the PJSIP endpoint.

Mitigation
Update to version 13.21.1, 14.7.7 or 15.4.1.

Vulnerable software versions

Asterisk Open Source: 15.0.0 - 15.2.2, 14.0 - 14.7.6, 13.0.0 - 13.19.2

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External links
http://downloads.asterisk.org/pub/security/AST-2018-008.html

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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.