High severity · published Dec 27, 2017
CVE-2017-17850
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
7.5
CVSS
75.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)75.4% · higher than 100% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
Asterisk · Digium
13.0.0 through 13.18.4; 14.0.0 through 14.7.4; 15.0.0 through 15.1.4 · source: NVD
CA
Certified Asterisk · Digium
13.1.0; 13.1.0; 13.1.0; 13.8 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-17850
CVE.org
https://www.cve.org/CVERecord?id=CVE-2017-17850
Vendor Advisory
http://downloads.asterisk.org/pub/security/AST-2017-014.html
Third Party Advisory
http://www.securitytracker.com/id/1040056
Issue Tracking
https://issues.asterisk.org/jira/browse/ASTERISK-27480
security.gentoo.org
https://security.gentoo.org/glsa/201811-11
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