CVE-2020-35652 Denial of service in n/a

What is CVE-2020-35652?

CVE-2020-35652 is a medium-severity denial of service vulnerability in Digium Asterisk, published on 29 Jan 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

An issue was discovered in res_pjsip_diversion.c in Sangoma Asterisk before 13.38.0, 14.x through 16.x before 16.15.0, 17.x before 17.9.0, and 18.x before 18.1.0. A crash can occur when a SIP message is received with a History-Info header that contains a tel-uri, or when a SIP 181 response is received that contains a tel-uri in the Diversion header.

Which versions are affected by CVE-2020-35652?

It affects 1 product.

Products include Digium Asterisk.

How do I fix CVE-2020-35652?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2020-35652 being exploited?

There is no known exploitation of CVE-2020-35652 in the wild and no public exploit code.

Other vulnerabilities in Digium Asterisk

• CVE-2017-14100 Command injection in n/a Critical 9.8
• CVE-2014-8418 Privilege escalation in n/a Critical 9.0
• CVE-2011-1599 Missing authorization in n/a Critical 9.0
• CVE-2017-16671 Memory corruption in n/a High 8.8
• CVE-2017-7617 Memory corruption in n/a High 8.8

All Digium Asterisk vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2020-35652, DEBIAN-CVE-2020-35652, GHSA-5jwx-hvg3-jjjv, UBUNTU-CVE-2020-35652.