Description
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.
Mitigation
Minimal update. May introduce new vulnerabilities or breaking changes.
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 debian 14 | | =0.1.11-3 || =0.1.11-3woody1 || =1:1.0.5-2 || =1:1.0.5-4 || =1:1.0.6-1 || =1:1.0.6-2 || =1:1.0.7-1 || =1:1.0.7.dfsg.1-1 || =1:1.0.7.dfsg.1-2 || =1:1.0.7.dfsg.1-2sarge1 || =1:1.0.7.dfsg.1-2sarge2 || =1:1.0.7.dfsg.1-2sarge3 || =1:1.0.7.dfsg.1-2sarge4 || =1:1.0.7.dfsg.1-2sarge5 || =1:1.0.7.dfsg.1-2sarge6 || =1:1.0.9.dfsg-1 || =1:1.0.9.dfsg-3 || =1:1.0.9.dfsg-4 || =1:1.0.9.dfsg-5 || =1:1.0.9.dfsg-6 || =1:1.2.0-beta1.dfsg-1 || =1:1.2.0-beta2.dfsg-1 || =1:1.2.0-beta2.dfsg-2 || =1:1.2.0-beta2.dfsg-3 || =1:1.2.0-rc1.dfsg-1 || =1:1.2.0-rc2.dfsg-1 || =1:1.2.0.dfsg-1 || =1:1.2.0.dfsg-2 || =1:1.2.0.dfsg-3 || =1:1.2.0.dfsg-4 || =1:1.2.0.dfsg-5 || =1:1.2.0.dfsg-6 || =1:1.2.1.dfsg-1 || =1:1.2.1.dfsg-2 || =1:1.2.1.dfsg-3 || =1:1.2.10.dfsg-1 || =1:1.2.10.dfsg-1bpo1 || =1:1.2.10.dfsg-2 || =1:1.2.10.dfsg-3 || =1:1.2.11.dfsg-1 || =1:1.2.12.1.dfsg-1 || =1:1.2.13~dfsg-1 || =1:1.2.13~dfsg-2 || =1:1.2.13~dfsg-2etch1 || =1:1.2.13~dfsg-2etch2 || =1:1.2.13~dfsg-2etch3 || =1:1.2.13~dfsg-2etch4 || =1:1.2.14~dfsg-1 || =1:1.2.14~dfsg-2 || =1:1.2.14~dfsg-3 || =1:1.2.14~dfsg-4 || =1:1.2.15~dfsg-1 || =1:1.2.16~dfsg-1 || =1:1.2.17~dfsg-1 || =1:1.2.4.dfsg-1 || =1:1.2.4.dfsg-2 || =1:1.2.4.dfsg-3 || =1:1.2.4.dfsg-4 || =1:1.2.4.dfsg-5 || =1:1.2.4.dfsg-6 || =1:1.2.4.dfsg-6+b1 || =1:1.2.4.dfsg-7 || =1:1.2.7.1.dfsg-1 || =1:1.2.7.1.dfsg-2 || =1:1.2.7.1.dfsg-3 || =1:1.2.9.1.dfsg-1 || =1:1.4.10~dfsg-1 || =1:1.4.11~dfsg-1 || =1:1.4.11~dfsg-2 || =1:1.4.11~dfsg-3 || =1:1.4.11~dfsg-4 || =1:1.4.13~dfsg-1 || =1:1.4.15~dfsg-1 || =1:1.4.16.2~dfsg-1 || =1:1.4.16.2~dfsg-2 || =1:1.4.17~dfsg-1 || =1:1.4.17~dfsg-2 || =1:1.4.18.1~dfsg-1 || =1:1.4.18~dfsg-1 || =1:1.4.19.1~dfsg-1 || =1:1.4.20~dfsg-1 || =1:1.4.21.1~dfsg-1 || =1:1.4.21.2~dfsg-1 || =1:1.4.21.2~dfsg-2 || =1:1.4.21.2~dfsg-3 || =1:1.4.21.2~dfsg-3+lenny1 || =1:1.4.21.2~dfsg-3+lenny2 || =1:1.4.21.2~dfsg-3+lenny2.1 || =1:1.4.21.2~dfsg-3+lenny3 || =1:1.4.21.2~dfsg-3+lenny5 || =1:1.4.21.2~dfsg-3+lenny6 || =1:1.4.21.2~dfsg-3.1 || =1:1.4.2~dfsg-1 || =1:1.4.2~dfsg-2 || =1:1.4.2~dfsg-3 || =1:1.4.2~dfsg-4 || =1:1.4.2~dfsg-5 || =1:1.4.3~dfsg-1 || =1:1.4.4~dfsg-1 || =1:1.4.4~dfsg-2 || =1:1.4.4~dfsg-3 || =1:1.4.5~dfsg-1 || =1:1.4.6~dfsg-1 || =1:1.4.8~dfsg-1 || =1:1.4.8~dfsg-2 || =1:1.4.9~dfsg-1 || =1:1.6.1.0~dfsg-1 || =1:1.6.1.0~dfsg~rc3-1 || =1:1.6.2.0-1 || =1:1.6.2.0~dfsg~beta3-1 || =1:1.6.2.0~dfsg~rc1-1 || =1:1.6.2.0~rc3-1 || =1:1.6.2.0~rc3-2 || =1:1.6.2.0~rc6-1 || =1:1.6.2.0~rc7-1 || =1:1.6.2.2-1 || =1:1.6.2.6-1 || =1:1.6.2.7-1 || =1:1.6.2.9-1 || =1:1.6.2.9-1~bpo50+1 || =1:1.6.2.9-1~bpo50+2 || =1:1.6.2.9-1~bpo50+3 || =1:1.6.2.9-2 || =1:1.6.2.9-2+squeeze1 || =1:1.6.2.9-2+squeeze10 || =1:1.6.2.9-2+squeeze11 || =1:1.6.2.9-2+squeeze12 || =1:1.6.2.9-2+squeeze2 || =1:1.6.2.9-2+squeeze3 || =1:1.6.2.9-2+squeeze4 || =1:1.6.2.9-2+squeeze5 || =1:1.6.2.9-2+squeeze6 || =1:1.6.2.9-2+squeeze7 || =1:1.6.2.9-2+squeeze8 || =1:1.6.2.9-2+squeeze9 || =1:1.8.10.0~dfsg-1 || =1:1.8.10.1~dfsg-1 || =1:1.8.11.1~dfsg-1 || =1:1.8.13.0~dfsg-1 || =1:1.8.13.0~dfsg-1~bpo60+1 || =1:1.8.13.1~dfsg-1 || =1:1.8.13.1~dfsg-1+powerpcspe1 || =1:1.8.13.1~dfsg-1~bpo60+1 || =1:1.8.13.1~dfsg-2 || =1:1.8.13.1~dfsg-3 || =1:1.8.3.3-1 || =1:1.8.4-1 || =1:1.8.4.2-1 || =1:1.8.4.3-1 || =1:1.8.4.4~dfsg-1 || =1:1.8.4.4~dfsg-2 || =1:1.8.7.1~dfsg-1 || =1:1.8.7.1~dfsg-2 || =1:1.8.7.1~dfsg-3 || =1:1.8.8.0~dfsg-1 || =1:1.8.8.2~dfsg-1 || =1:11.10.0~dfsg-1 || =1:11.10.0~dfsg-1~bpo70+1 || =1:11.10.2~dfsg-1 || =1:11.10.2~dfsg-1~bpo70+1 || =1:11.11.0~dfsg-1 || =1:11.11.0~dfsg-1~bpo70+1 || =1:11.11.0~dfsg-2 || =1:11.12.0~dfsg-1 || =1:11.12.0~dfsg-1~bpo70+1 || =1:11.12.1~dfsg-1 || =1:11.13.0~dfsg-1 || =1:11.13.0~dfsg-1~bpo70+1 || =1:11.13.1~dfsg-1 || =1:11.13.1~dfsg-2 || =1:11.13.1~dfsg-2~bpo70+1 || =1:11.5.1~dfsg-1 || =1:11.5.1~dfsg-2 || =1:11.5.1~dfsg1-1 || =1:11.5.1~dfsg1-1~bpo70+1 || =1:11.6.0~dfsg-1 || =1:11.6.0~dfsg-2 || =1:11.6.0~dfsg-3 || =1:11.7.0~dfsg-1 || =1:11.7.0~dfsg-1+e1 || =1:11.7.0~dfsg-1~bpo70+1 || =1:11.8.0~dfsg-1 || =1:11.8.0~dfsg-2 || =1:11.8.1~dfsg-1 || =1:11.8.1~dfsg-1~bpo70+1 || =1:11.9.0~dfsg-1 || =1:11.9.0~dfsg-2 || =1:11.9.0~dfsg-2~bpo70+1 || =1:13.0.0~dfsg-1 || =1:13.0.0~dfsg-2 || =1:13.1.0~dfsg-1 || =1:13.1.0~dfsg-1.1 || =1:13.10.0~dfsg-1 || =1:13.11.2~dfsg-1 || =1:13.12.1~dfsg-1 || =1:13.12.2~dfsg-1 || =1:13.12.2~dfsg-2 || =1:13.7.2~dfsg-1 || =1:13.8.0~dfsg-1 || =1:13.8.2~dfsg-1 || =1:13.9.1~dfsg-1 || =1:13.9.1~dfsg-2 || >=0 <1:13.13.1~dfsg-1 | 1:13.13.1~dfsg-1 |
