[NEWS] Gecko Based Browsers Proxy Auto-Config Script DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 09/27/05

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Date: 27 Sep 2005 15:38:16 +0200

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      Gecko Based Browsers Proxy Auto-Config Script DoS
    ------------------------------------------------------------------------

    SUMMARY

    Improper variable checking can cause Gecko based browsers to crash when
    handling PAC scripts.

    DETAILS

    Vulnerable Systems:
     * Netscape Browser version 8.0.3.3
     * Mozilla Firefox version 1.0.6

    Immune Systems:
     * Mozilla Firefox version 1.0.7

    When handling a PAC file Gecko based browsers do not validate variables
    properly. PAC files that contain a NULL character will cause the browser
    to crash.

    Patch:
    Index: mozilla/js/src/jsobj.c
    -==================================================================
    RCS file: /cvsroot/mozilla/js/src/jsobj.c,v
    retrieving revision 3.204
    diff -u -r3.204 mozilla/js/src/jsobj.c
    --- mozilla/js/src/jsobj.c
    +++ mozilla/js/src/jsobj.c
    @@ -1128,7 +1128,8 @@
         rt = cx->runtime;
         if (rt->findObjectPrincipals) {
           scopePrincipals = rt->findObjectPrincipals(cx, scopeobj);
    - if (!principals->subsume(principals, scopePrincipals)) {
    + if (scopePrincipals &&
    + !principals->subsume(principals, scopePrincipals)) {
             JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
                       JSMSG_BAD_INDIRECT_CALL, js_eval_str);
             return JS_FALSE;
    Index: mozilla/js/src/jsscript.c
    -==================================================================
    RCS file: /cvsroot/mozilla/js/src/jsscript.c,v
    retrieving revision 3.78
    diff -u -r3.78 mozilla/js/src/jsscript.c
    --- mozilla/js/src/jsscript.c
    +++ mozilla/js/src/jsscript.c
    @@ -306,7 +306,8 @@
         rt = cx->runtime;
         if (rt->findObjectPrincipals) {
           scopePrincipals = rt->findObjectPrincipals(cx, scopeobj);
    - if (!principals->subsume(principals, scopePrincipals)) {
    + if (scopePrincipals &&
    + !principals->subsume(principals, scopePrincipals)) {
             JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
                       JSMSG_BAD_INDIRECT_CALL,
                       "Script.prototype.exec");

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:juha-matti.laurio@netti.fi>
    Juha-Matti Laurio.
    The vendor bug report can be found at:
    <https://bugzilla.mozilla.org/show_bug.cgi?id=302100>
    https://bugzilla.mozilla.org/show_bug.cgi?id=302100

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