[asterisk-bugs] [JIRA] (ASTERISK-25490) SDP crypto tag is validated incorrectly

[Richard Mudgett (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-25490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=228003#comment-228003 ] 

Richard Mudgett commented on ASTERISK-25490:
--------------------------------------------

Thanks for the contribution! If you'd like your contribution to be included faster, you should submit your patch for code review by the Asterisk Developer Community. To do so, please follow the Code Review [1] instructions on the wiki. Be sure to:
* Verify that your patch conforms to the Coding Guidelines [2]
* Review the Code Review Checklist [3] for common items reviewers will look for
* If necessary, provide tests for the Asterisk Test Suite that verify the correctness of your patch [4]

When ready, submit your patch and any tests to Review Board [5] for code review.

Thanks!

[1] https://wiki.asterisk.org/wiki/display/AST/Code+Review
[2] https://wiki.asterisk.org/wiki/display/AST/Coding+Guidelines
[3] https://wiki.asterisk.org/wiki/display/AST/Code+Review+Checklist
[4] https://wiki.asterisk.org/wiki/display/AST/Asterisk+Test+Suite+Documentation
[5] https://wiki.asterisk.org/wiki/display/AST/Review+Board+Usage

Also patches *must* be submitted with a signed license agreement in place no matter how trivial the patch.  A link to an external location is not acceptable as the patch cannot be confirmed as licensed.

> SDP crypto tag is validated incorrectly
> ---------------------------------------
>
>                 Key: ASTERISK-25490
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25490
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/SRTP
>    Affects Versions: 11.20.0
>         Environment: Interoperability with Snom D725
>            Reporter: Joerg Sonnenberger
>
> When trying to forward a call from a D725 with encrypted RTP, the crypto handshake fails as the phone tries to use a zero crypto tag.
> A potential fix can be found in https://www.netbsd.org/~joerg/patch-channels_sip_sdp__crypto.c
> The same issue should apply to newer releases as well, but I can't test that easily.



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