Improper input validation in Asterisk Open Source - CVE-2018-7284

Vulnerability identifier: #VU10698

CSH Severity: Low

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2018-7284

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: Public exploit is available

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

The weakness exists due to improper input validation. A remote attacker can send a SUBSCRIBE request with specially crafted Accept headersб trigger a flaw in the 'res_pjsip_pubsub' module and cause the target service to crash.

Asterisk Open Source
asterisk (Debian package)

Update to version 13.19.2, 14.7.6, 15.2.2.

asterisk (Debian package) - update to 1:13.14.1~dfsg-2+deb9u4

• Exploit #6418 - Asterisk chan_pjsip 15.2.0 - 'SUBSCRIBE' Stack Corruption (June 17, 2021)
• Exploit #2181 - astDoS (Tool to exploit CVE-2018-7284 and CVE-2018-19278) (March 18, 2020)

• http://downloads.asterisk.org/pub/security/AST-2018-004.html

• Denial of service in Digium Asterisk
• Debian update for asterisk