[UNIX] Asterisk CallerID CDR SQL Injection

From: SecuriTeam (support_at_securiteam.com)
Date: 09/16/03

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Date: 16 Sep 2003 15:37:08 +0200

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      Asterisk CallerID CDR SQL Injection
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.asterisk.org/> Asterisk is a complete PBX (Private Branch
    eXchange) in software. It runs on Linux and provides all of the features
    you would expect from a PBX and more. Asterisk does voice over IP with
    three protocols (SIP, IAX v1 and v2, and H323), and can interoperate with
    almost all standards-based telephony equipment using relatively
    inexpensive hardware.

    Call Detail Records (CDRs) are generated by telephony systems in order to
    perform a number of functions such as billing and rating. CDRs contain a
    number of fields that identify useful information about the call including
    source, destination, and other items such as CallerID. These can be
    generated numerous times during the call to indicate the state of the call
    as well.

    @stake found an issue while conducting a source code review of the CDR
    logging functionality. It is possible to perform SQL injection if an
    attacker can supply a malformed CallerID string.

    The interesting thing to note about this vulnerability is that is cannot
    only be launched via VoIP protocols, but also through fixed-line
    connections (i.e. POTS - Plain Old Telephone System).

    DETAILS

    @stake discovered that minimal input validation occurred between CDR
    generation and the acceptance of this data as part of the SQL query.

    SQL injection is covered in details in:
    1) SQL Injection -
    <http://www.spidynamics.com/papers/SQLInjectionWhitePaper.pdf>
    http://www.spidynamics.com/papers/SQLInjectionWhitePaper.pdf

    2) Advanced SQL Injection -
    <http://www.ngssoftware.com/papers/advanced_sql_injection.pdf>
    http://www.ngssoftware.com/papers/advanced_sql_injection.pdf

    As a result, it is possible for a remote unauthenticated user to perform
    arbitrary database operations.

    Recommendation:
    @stake notified the author of this particular code on the 17th of August.
    The author developed and deployed a patch silently to the CVS on the 9th
    of September.

    @stake recommends that if you have not deployed a CVS version since the
    9th of September 2003 to immediately do so.

    ADDITIONAL INFORMATION

    The original advisory can be downloaded from:
    <http://www.atstake.com/research/advisories/2003/a091103-1.txt>
    http://www.atstake.com/research/advisories/2003/a091103-1.txt.

    The information has been provided by <mailto:advisories@atstake.com>
    @stake Advisories.

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