[UNIX] University of Minnesota Gopherd do_command Buffer Overflow Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 07/24/03

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Date: 24 Jul 2003 15:43:59 +0200

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      University of Minnesota Gopherd do_command Buffer Overflow Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

    The <ftp://boombox.micro.umn.edu/pub/gopher/> UMN gopher server. This
    server is "a robust and full-featured gopher and gopher+ server with a
    HTTP mode as well. It features support for indexing, ASK blocks, .Links
    files, .names files, .cap support, and pretty much any gopher feature you
    could imagine". A buffer overflow in the Gopherd's do_command() function
    allows remote attackers to cause the program to execute arbitrary code.

    DETAILS

    Vulnerable systems:
     * UMN Gopherd version 3.0.5 and prior

    Vulnerable code:
    In Gopherd.c /do_command() you can see:

    ..
     CMDfromNet(cmd, sockfd);

    ..

       if (authpw == NULL || authuser == NULL)
                Die(sockfd, 411, "Missing Username or password");
            } /* End else */
             } else {
            authuser = CMDgetAskline(cmd, 0);...................ponit
            authpw = CMDgetAskline(cmd, 1);
             }

    ..
          case AUTHRES_OK:

            Gticket = (char*) malloc(sizeof(char*) *
                   (strlen(authuser) +
                    strlen(authpw)+5));
            strcpy(cleartext, authuser); ...............ponit
            strcat(cleartext, " ");
            strcat(cleartext, authpw);

    ...

    command.h/ #define CMDgetAskline(a,b) (STAgetText((a)->asklines,b))

    ...

    Therefore there is an unchecked length of the strcpy() function.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:nic0x333@hotmail.com> nic.

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

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