[v2.3] Multiple vulnerabilities in asterisk < 1.8.11.1 may allow remote code execution
https://issues.asterisk.org/jira/browse/ASTERISK-17465
https://issues.asterisk.org/jira/browse/ASTERISK-19592
https://issues.asterisk.org/jira/browse/ASTERISK-19770
Solution:
- Upgrade to 1.8.11.1
(from redmine: issue id 1159, created on 2012-05-14, closed on 2012-05-17)