[asterisk-bugs] [JIRA] (ASTERISK-30176) manager: GetConfig can read files outside of Asterisk

[George Joseph (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-30176?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

George Joseph updated ASTERISK-30176:
-------------------------------------

    Security: None  (was: Reporter, Bug Marshals, and Digium)

> manager: GetConfig can read files outside of Asterisk
> -----------------------------------------------------
>
>                 Key: ASTERISK-30176
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-30176
>             Project: Asterisk
>          Issue Type: Security
>      Security Level: None
>          Components: Core/ManagerInterface
>    Affects Versions: 18.13.0
>         Environment: Linux Ubuntu 20.04 LTS with asterisk built from source
>            Reporter: shawty
>            Severity: Blocker
>              Labels: security
>
> As per the request made by "jcolp" here : https://community.asterisk.org/t/synchronising-voicemail-folders/93584/32
> I've discovered that any config file that follows the same section/key:value format as the config files asterisk uses, can be read given the files system permissions allow it, by the "GetConfig" manager command.
> Files not in the same format (such as /etc/passwd) will cause an error, but the method does still try to read them.
> I successfully managed to read the samba config file, among others on the dev server I was using for my asterisk work.
> I initially found this out, as I was looking for a way to access the TXT files that are used to store Voicemail message info, and found that by specifying the full path to the file I was able to read it.
> My curiosity being what it is, I tried this on some non asterisk files and was surprised to see that I could read those too.
> This was on a default installation, so no extra steps have been taken to lock down files and configs from other apps running on the same server instance, files do need to have the group & others read ability set, which on a default install is generally every config in /etc and many others.
> I have NOT however tested to see if writes work outside of asterisk's files.



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