An issue was discovered in Asterisk Open Source 11.x before 11.25.1, 13.x before 13.13.1, and 14.x before 14.2.1 and Certified Asterisk 11.x before 11.6-cert16 and 13.x before 13.8-cert4. The chan_sip channel driver has a liberal definition for whitespace when attempting to strip the content between a SIP header name and a colon character. Rather than following RFC 3261 and stripping only spaces and horizontal tabs, Asterisk treats any non-printable ASCII character as if it were whitespace. This means that headers such as Contact\x01: will be seen as a valid Contact header. This mostly does not pose a problem until Asterisk is placed in tandem with an authenticating SIP proxy. In such a case, a crafty combination of valid and invalid To headers can cause a proxy to allow an INVITE request into Asterisk without authentication since it believes the request is an in-dialog request. However, because of the bug described above, the request will look like an out-of-dialog request to Asterisk. Asterisk will then process the request as a new call. The result is that Asterisk can process calls from unvetted sources without any authentication. If you do not use a proxy for authentication, then this issue does not affect you. If your proxy is dialog-aware (meaning that the proxy keeps track of what dialogs are currently valid), then this issue does not affect you. If you use chan_pjsip instead of chan_sip, then this issue does not affect you.
2016-12-12T21:59:01.617
2025-04-12T10:46:40.837
Deferred
CVSSv3.0: 5.3 (MEDIUM)
AV:N/AC:L/Au:N/C:N/I:P/A:N
10.0
2.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | digium | asterisk | 11.0.0 | Yes |
| Application | digium | asterisk | 11.0.0 | Yes |
| Application | digium | asterisk | 11.0.0 | Yes |
| Application | digium | asterisk | 11.0.0 | Yes |
| Application | digium | asterisk | 11.0.0 | Yes |
| Application | digium | asterisk | 11.0.1 | Yes |
| Application | digium | asterisk | 11.0.2 | Yes |
| Application | digium | asterisk | 11.1.0 | Yes |
| Application | digium | asterisk | 11.1.0 | Yes |
| Application | digium | asterisk | 11.1.0 | Yes |
| Application | digium | asterisk | 11.1.1 | Yes |
| Application | digium | asterisk | 11.1.2 | Yes |
| Application | digium | asterisk | 11.2.0 | Yes |
| Application | digium | asterisk | 11.2.0 | Yes |
| Application | digium | asterisk | 11.2.0 | Yes |
| Application | digium | asterisk | 11.2.1 | Yes |
| Application | digium | asterisk | 11.2.2 | Yes |
| Application | digium | asterisk | 11.3.0 | Yes |
| Application | digium | asterisk | 11.4.0 | Yes |
| Application | digium | asterisk | 11.5.0 | Yes |
| Application | digium | asterisk | 11.5.1 | Yes |
| Application | digium | asterisk | 11.6.0 | Yes |
| Application | digium | asterisk | 11.6.1 | Yes |
| Application | digium | asterisk | 11.7.0 | Yes |
| Application | digium | asterisk | 11.8.0 | Yes |
| Application | digium | asterisk | 11.8.1 | Yes |
| Application | digium | asterisk | 11.9.0 | Yes |
| Application | digium | asterisk | 11.10.0 | Yes |
| Application | digium | asterisk | 11.10.1 | Yes |
| Application | digium | asterisk | 11.10.2 | Yes |
| Application | digium | asterisk | 11.11.0 | Yes |
| Application | digium | asterisk | 11.12.0 | Yes |
| Application | digium | asterisk | 11.12.1 | Yes |
| Application | digium | asterisk | 11.13.0 | Yes |
| Application | digium | asterisk | 11.13.1 | Yes |
| Application | digium | asterisk | 11.14.0 | Yes |
| Application | digium | asterisk | 11.14.1 | Yes |
| Application | digium | asterisk | 11.14.2 | Yes |
| Application | digium | asterisk | 11.15.0 | Yes |
| Application | digium | asterisk | 11.15.1 | Yes |
| Application | digium | asterisk | 11.16.0 | Yes |
| Application | digium | asterisk | 11.17.0 | Yes |
| Application | digium | asterisk | 11.17.1 | Yes |
| Application | digium | asterisk | 11.18.0 | Yes |
| Application | digium | asterisk | 11.19.0 | Yes |
| Application | digium | asterisk | 11.20.0 | Yes |
| Application | digium | asterisk | 11.21.0 | Yes |
| Application | digium | asterisk | 11.21.1 | Yes |
| Application | digium | asterisk | 11.21.2 | Yes |
| Application | digium | asterisk | 11.22.0 | Yes |
| Application | digium | asterisk | 11.22.0 | Yes |
| Application | digium | asterisk | 11.23.0 | Yes |
| Application | digium | asterisk | 11.23.0 | Yes |
| Application | digium | asterisk | 11.23.1 | Yes |
| Application | digium | asterisk | 11.24.0 | Yes |
| Application | digium | asterisk | 11.24.1 | Yes |
| Application | digium | asterisk | 11.25.0 | Yes |
| Application | digium | asterisk | 13.0.0 | Yes |
| Application | digium | asterisk | 13.0.0 | Yes |
| Application | digium | asterisk | 13.0.0 | Yes |
| Application | digium | asterisk | 13.0.0 | Yes |
| Application | digium | asterisk | 13.0.1 | Yes |
| Application | digium | asterisk | 13.0.2 | Yes |
| Application | digium | asterisk | 13.1.0 | Yes |
| Application | digium | asterisk | 13.1.1 | Yes |
| Application | digium | asterisk | 13.2.0 | Yes |
| Application | digium | asterisk | 13.2.1 | Yes |
| Application | digium | asterisk | 13.3.0 | Yes |
| Application | digium | asterisk | 13.3.1 | Yes |
| Application | digium | asterisk | 13.3.2 | Yes |
| Application | digium | asterisk | 13.4.0 | Yes |
| Application | digium | asterisk | 13.5.0 | Yes |
| Application | digium | asterisk | 13.6.0 | Yes |
| Application | digium | asterisk | 13.7.0 | Yes |
| Application | digium | asterisk | 13.7.1 | Yes |
| Application | digium | asterisk | 13.7.2 | Yes |
| Application | digium | asterisk | 13.8.0 | Yes |
| Application | digium | asterisk | 13.8.0 | Yes |
| Application | digium | asterisk | 13.8.1 | Yes |
| Application | digium | asterisk | 13.8.2 | Yes |
| Application | digium | asterisk | 13.9.0 | Yes |
| Application | digium | asterisk | 13.9.1 | Yes |
| Application | digium | asterisk | 13.10.0 | Yes |
| Application | digium | asterisk | 13.10.0 | Yes |
| Application | digium | asterisk | 13.11.0 | Yes |
| Application | digium | asterisk | 13.11.1 | Yes |
| Application | digium | asterisk | 13.11.2 | Yes |
| Application | digium | asterisk | 13.12.0 | Yes |
| Application | digium | asterisk | 13.12.1 | Yes |
| Application | digium | asterisk | 13.12.2 | Yes |
| Application | digium | asterisk | 13.13.0 | Yes |
| Application | digium | asterisk | 14.0.0 | Yes |
| Application | digium | asterisk | 14.0.0 | Yes |
| Application | digium | asterisk | 14.0.0 | Yes |
| Application | digium | asterisk | 14.0.0 | Yes |
| Application | digium | asterisk | 14.0.0 | Yes |
| Application | digium | asterisk | 14.0.1 | Yes |
| Application | digium | asterisk | 14.0.2 | Yes |
| Application | digium | asterisk | 14.1.0 | Yes |
| Application | digium | asterisk | 14.1.1 | Yes |
| Application | digium | asterisk | 14.1.2 | Yes |
| Application | digium | asterisk | 14.2.0 | Yes |
| Application | digium | certified_asterisk | 11.0.0 | Yes |
| Application | digium | certified_asterisk | 11.0.0 | Yes |
| Application | digium | certified_asterisk | 11.0.0 | Yes |
| Application | digium | certified_asterisk | 11.1.0 | Yes |
| Application | digium | certified_asterisk | 11.1.0 | Yes |
| Application | digium | certified_asterisk | 11.1.0 | Yes |
| Application | digium | certified_asterisk | 11.1.0 | Yes |
| Application | digium | certified_asterisk | 11.2.0 | Yes |
| Application | digium | certified_asterisk | 11.2.0 | Yes |
| Application | digium | certified_asterisk | 11.2.0 | Yes |
| Application | digium | certified_asterisk | 11.3.0 | Yes |
| Application | digium | certified_asterisk | 11.3.0 | Yes |
| Application | digium | certified_asterisk | 11.3.0 | Yes |
| Application | digium | certified_asterisk | 11.4.0 | Yes |
| Application | digium | certified_asterisk | 11.4.0 | Yes |
| Application | digium | certified_asterisk | 11.4.0 | Yes |
| Application | digium | certified_asterisk | 11.4.0 | Yes |
| Application | digium | certified_asterisk | 11.5.0 | Yes |
| Application | digium | certified_asterisk | 11.5.0 | Yes |
| Application | digium | certified_asterisk | 11.5.0 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6 | Yes |
| Application | digium | certified_asterisk | 11.6.0 | Yes |
| Application | digium | certified_asterisk | 11.6.0 | Yes |
| Application | digium | certified_asterisk | 11.6.0 | Yes |
| Application | digium | certified_asterisk | 11.6.0 | Yes |