#VU15804 Information disclosure in Asterisk Open Source and Certified Asterisk - CVE-2018-12227

Vulnerability identifier: #VU15804

Vulnerability risk: Low

CVSSv4.0: 2.7 [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:U/U:Clear]

CVE-ID: CVE-2018-12227

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

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

Vendor: Digium (Linux Support Services)

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to application responds with different error codes depending on presence of ACL rules for SIP requests. A remote attacker can identify presence of ACL rules.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Asterisk Open Source: 13.0.0 - 13.19.2, 14.0 - 14.7.6, 15.0.0 - 15.4.0

Certified Asterisk: 13.18-cert1 - 13.21

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External links
https://downloads.asterisk.org/pub/security/AST-2018-008.html
https://issues.asterisk.org/jira/browse/ASTERISK-27818

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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.