[asterisk-bugs] [JIRA] (ASTERISK-29381) chan_pjsip: Remote denial of service by an authenticated user

[Friendly Automation (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-29381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=255696#comment-255696 ] 

Friendly Automation commented on ASTERISK-29381:
------------------------------------------------

Change 16211 merged by Friendly Automation:
AST-2021-007 - res_pjsip_session: Don't offer if no channel exists.

[https://gerrit.asterisk.org/c/asterisk/+/16211|https://gerrit.asterisk.org/c/asterisk/+/16211]

> chan_pjsip: Remote denial of service by an authenticated user
> -------------------------------------------------------------
>
>                 Key: ASTERISK-29381
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-29381
>             Project: Asterisk
>          Issue Type: Security
>      Security Level: None
>          Components: Resources/res_pjsip_session
>    Affects Versions: 16.17.0, 18.3.0
>            Reporter: Ivan Poddubny
>            Assignee: Joshua C. Colp
>            Severity: Blocker
>              Labels: patch, security
>      Target Release: 16.19.1, 18.5.1
>
>         Attachments: AST-2021-007-16.diff, AST-2021-007-18.diff, AST-2021-007.pdf, extensions.conf, pjsip.conf, test.sh, test.xml, verbose-crash.txt
>
>
> A remote party can provoke a crash of asterisk (18.3.0, 16.17.0, master) by sending a re-INVITE after asterisk has sent a BYE (and hasn't received a response to it).
> The issue was introduced in a commit fixing ASTERISK-28452 ("res_pjsip_session: Always produce offer on re-INVITE without SDP"). The new pjsip callback added in the commit (session_inv_on_create_offer) assumes that ast_sip_session always has a channel:
> {code}
>        ast_queue_unhold(session->channel);
> {code}
> When {{session->channel}} is NULL, {{ast_queue_unhold(NULL)}} causes Asterisk to log a few assertion failures and crash.
> An example scenario is attached (configs + sipp + verbose console output).



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