Alligra Calligra – Heap Buffer Overflow

• Exploit Database
• 15 阅读

• 作者： Charlie Miller
  日期： 2012-08-07
• 类别：

  • remote
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/37576/

• source: https://www.securityfocus.com/bid/54816/info
  
  Calligra is prone to a remote buffer-overflow vulnerability.
  
  An attacker can exploit this issue to execute arbitrary code in the context of the user running the affected application. Failed exploit attempts will likely result in denial-of-service conditions.
  
  Calligra 2.4.3 and KOffice 2.3.3 are vulnerable; other versions may also be affected. 
  
  bool STD::read( U16 baseSize, U16 totalSize, OLEStreamReader* stream, bool
  preservePos )
  ...
  grupxLen = totalSize - ( stream->tell() - startOffset );
  grupx = new U8[ grupxLen ];
  int offset = 0;
  for ( U8 i = 0; i < cupx; ++i) {
  U16 cbUPX = stream->readU16(); // size of the next UPX
  stream->seek( -2, G_SEEK_CUR ); // rewind the "lookahead"
  cbUPX += 2; // ...and correct the size
  for ( U16 j = 0; j < cbUPX; ++j ) {
  grupx[ offset + j ] = stream->readU8(); // read the whole UPX
  }