Memory corruption in Asterisk Open Source and Certified Asterisk - #VU6619
Published: May 23, 2017
Vulnerability identifier: #VU6619
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Digium (Linux Support Services)
Affected software:
Asterisk Open Source
Certified Asterisk
Asterisk Open Source
Certified Asterisk
Detailed vulnerability description
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The weakness exists due to insufficient allocation of a buffer size by the PJSIP RFC 2543 transaction key generation algorithm. A remote attacker can send a specially crafted Session Initiation Protocol (SIP) packet containing a long CSeq header value along with a Via header with no branch parameter, trigger memory corruption and cause the affected device to crash.
Successful exploitation of the vulnerability results in denial of service.
The weakness exists due to insufficient allocation of a buffer size by the PJSIP RFC 2543 transaction key generation algorithm. A remote attacker can send a specially crafted Session Initiation Protocol (SIP) packet containing a long CSeq header value along with a Via header with no branch parameter, trigger memory corruption and cause the affected device to crash.
Successful exploitation of the vulnerability results in denial of service.
Remediation
Update Asterisk to version 13.15.1 and 14.4.1.
Update Certified Asterisk to version 13.13-cert.
Update Certified Asterisk to version 13.13-cert.