[UNIX] Remote Heap Corruption Overflow vulnerability in WsMp3d (CHA)

From: SecuriTeam (support_at_securiteam.com)
Date: 05/21/03

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    Date: 21 May 2003 18:59:31 +0200
    
    

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      Remote Heap Corruption Overflow vulnerability in WsMp3d (CHA)
    ------------------------------------------------------------------------

    SUMMARY

     <http://wsmp3.sourceforge.net> WsMp3d is a "web server which also acts as
    a ShoutCast-server". A remotely exploitable heap vulnerability allows
    attackers to cause the program to execute arbitrary code.

    DETAILS

    Due to misallocation and incorrect utilization of resources, a heap
    overflow vulnerability can be caused by a remote attacker, allowing him to
    execute arbitrary code.

    Patch:
    --- req_descriptor.c Mon Dec 2 22:21:35 2002
    +++ req_descriptor.patch.c Sat May 3 03:25:32 2003
    @@ -201,11 +201,11 @@
       if(PDEBUG) printf("Entro in parse_request\n");
     
       for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
    - strncpy(reqcpy,req,strlen(req));
    + strncpy(reqcpy,req,(10-1));
       ritorno->action=get_op(reqcpy);
     
       for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
    - strncpy(reqcpy,req,strlen(req));
    + strncpy(reqcpy,req,(1024-1));
       if(ritorno->action!=NULL)
         {
           if(!strcmp(ritorno->action,"CHA"))
    ritorno->what=nomefile(reqcpy,1) ;
    @@ -214,55 +214,55 @@
       else ritorno->what=NULL;
     
       for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
    - strncpy(reqcpy,req,strlen(req));
    + strncpy(reqcpy,req,(1024-1));
       ritorno->host=gimme_line(reqcpy,"Host: ");
     
       for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
    - strncpy(reqcpy,req,strlen(req));
    + strncpy(reqcpy,req,(1024-1));
       ritorno->agent=gimme_line(reqcpy,"User-Agent: ");
     
       for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
    - strncpy(reqcpy,req,strlen(req));
    + strncpy(reqcpy,req,(1024-1));
       ritorno->accept=gimme_line(reqcpy,"Accept: ");
     
       for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
    - strncpy(reqcpy,req,strlen(req));
    + strncpy(reqcpy,req,(1024-1));
       ritorno->lang=gimme_line(reqcpy,"Accept-Language: ");
     
       for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
    - strncpy(reqcpy,req,strlen(req));
    + strncpy(reqcpy,req,(1024-1));
       ritorno->enc=gimme_line(reqcpy,"Accept-Encoding: ");
     
       for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
    - strncpy(reqcpy,req,strlen(req));
    + strncpy(reqcpy,req,(1024-1));
       ritorno->charset=gimme_line(reqcpy,"Accept-Charset: ");
     
       for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
    - strncpy(reqcpy,req,strlen(req));
    + strncpy(reqcpy,req,(1024-1));
       ritorno->keep=gimme_line(reqcpy,"Keep-Alive: ");
     
       for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
    - strncpy(reqcpy,req,strlen(req));
    + strncpy(reqcpy,req,(1024-1));
       ritorno->conn=gimme_line(reqcpy,"Connection: ");
     
       for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
    - strncpy(reqcpy,req,strlen(req));
    + strncpy(reqcpy,req,(1024-1));
       ritorno->referer=gimme_line(reqcpy,"Referer: ");
     
       for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
    - strncpy(reqcpy,req,strlen(req));
    + strncpy(reqcpy,req,(1024-1));
       ritorno->pragma=gimme_line(reqcpy,"Pragma: ");
     
       for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
    - strncpy(reqcpy,req,strlen(req));
    + strncpy(reqcpy,req,(1024-1));
       ritorno->contType=gimme_line(reqcpy,"Content-Type: ");
     
       for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
    - strncpy(reqcpy,req,strlen(req));
    + strncpy(reqcpy,req,(1024-1));
       ritorno->contLength=gimme_line(reqcpy,"Content-Length: ");
     
       for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
    - strncpy(reqcpy,req,strlen(req));
    + strncpy(reqcpy,req,(1024-1));
       ritorno->content=gimme_content(reqcpy);
       for(i=0;i<BUFSIZE;i++) reqcpy[i]='\0';
       return ritorno;

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:xploit@hackermail.com>
    dong-h0un U.

    ========================================

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