IBM Support

PH17737: WEBSPHERE DOES NOT REJECT SIP INVITE WITH INVALID CSEQ HEADER

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APAR status

  • Closed as program error.

Error description

  • WebSphere does not reject requests with an invalid CSeq
    header
    

Local fix

  • N/A
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All Session Initiation Protocol (SIP)       *
    *                  Container users of IBM WebSphere            *
    *                  Application Server                          *
    ****************************************************************
    * PROBLEM DESCRIPTION: If an attacker sends a SIP INVITE       *
    *                      with an invalid CSeq header, rather     *
    *                      than rejecting the malformed INVITE,    *
    *                      WebSphere dispatches it to the          *
    *                      SipServlet.                             *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    If an attacker sends a SIP INVITE with an invalid CSeq header,
    rather than rejecting the malformed INVITE, WebSphere
    dispatches it to the SipServlet.
    

Problem conclusion

  • SIP requests with malformed CSeq headers are rejected with an
    400 error response.
    
    The fix for this APAR is currently targeted for inclusion in
    fix pack 8.5.5.17 and 9.0.5.3.  Please refer to the Recommended
    Updates page for delivery information:
    http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH17737

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-10-04

  • Closed date

    2019-11-11

  • Last modified date

    2019-11-11

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    WEBS APP SERV N

  • Fixed component ID

    5724H8800

Applicable component levels



Document information

More support for: WebSphere Application Server
General

Software version: 850

Reference #: PH17737

Modified date: 11 November 2019