[asterisk-bugs] [JIRA] (ASTERISK-25893) Function vmauthenticate accesses uninitialized memory

[Asterisk Team (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-25893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=230147#comment-230147 ] 

Asterisk Team commented on ASTERISK-25893:
------------------------------------------

Thanks for creating a report! The issue has entered the triage process. That means the issue will wait in this status until a Bug Marshal has an opportunity to review the issue. Once the issue has been reviewed you will receive comments regarding the next steps towards resolution.

A good first step is for you to review the [Asterisk Issue Guidelines|https://wiki.asterisk.org/wiki/display/AST/Asterisk+Issue+Guidelines] if you haven't already. The guidelines detail what is expected from an Asterisk issue report.

Then, if you are submitting a patch, please review the [Patch Contribution Process|https://wiki.asterisk.org/wiki/display/AST/Patch+Contribution+Process].

> Function vmauthenticate accesses uninitialized memory
> -----------------------------------------------------
>
>                 Key: ASTERISK-25893
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25893
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Applications/app_voicemail
>    Affects Versions: 13.7.2
>            Reporter: Filip Jenicek
>
> The problem is in function vmauthenticate, on lines
> {code}
> 	if (!vm_authenticate(chan, mailbox, sizeof(mailbox), &vmus, context, NULL, skipuser, 3, silent)) {
> 		pbx_builtin_setvar_helper(chan, "AUTH_MAILBOX", mailbox);
> 		pbx_builtin_setvar_helper(chan, "AUTH_CONTEXT", vmus.context);
> {code}
> If skipuser>0, then vm_authenticate does not fill the vmus variable, because of the condition:
> {code}
> 	if (vmu && !skipuser) {
> 		memcpy(res_vmu, vmu, sizeof(struct ast_vm_user));
> 	}
> {code}
> The result is that AUTH_CONTEXT is set with an uninitialized memory, following errors are logged:
> {code}
> [06/Apr/2016 04:51:12] asterisk[32621] [C-00000000]json.c:704 in ast_json_vpack: Error building JSON from '{s: s, s: s}': Invalid UTF-8 string.
> [06/Apr/2016 04:51:12] asterisk[32621] [C-00000000]stasis_channels.c:774 in ast_channel_publish_varset: Error creating message name=AUTH_CONTEXT value=ެ��
> {code}



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