CVE-2017-17850 Null dereference in n/a
A missing contact header in SIP messages causes a null pointer dereference crash in Asterisk, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-17850?
CVE-2017-17850 is a high-severity vulnerability in Digium Asterisk, published on 23 Dec 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in Asterisk 13.18.4 and older, 14.7.4 and older, 15.1.4 and older, and 13.18-cert1 and older. A select set of SIP messages create a dialog in Asterisk. Those SIP messages must contain a contact header. For those messages, if the header was not present and the PJSIP channel driver was used, Asterisk would crash. The severity of this vulnerability is somewhat mitigated if authentication is enabled. If authentication is enabled, a user would have to first be authorized before reaching the crash point.
Weakness: CWE-20
Which versions are affected by CVE-2017-17850?
It affects 2 products.
Products include Digium Asterisk, Digium Certified Asterisk.
How do I fix CVE-2017-17850?
Upgrade to a fixed version.
Is CVE-2017-17850 being exploited?
There is no known exploitation of CVE-2017-17850 in the wild and no public exploit code.
Other vulnerabilities in Digium Asterisk
Sources
Also known as DEBIAN-CVE-2017-17850, GHSA-cx4v-84p4-4vh6, UBUNTU-CVE-2017-17850.