[Veronica] Scheduled Sequence Processed

[minhyuk]

Summary of Repository Review

Vulnerabilities Reported:

From handler.c

1. Memory Leaks:

   • The malloced memory for buf is not freed when send(sock, buf, size, 0) returns an error.

      str = malloc(100);
   

2. Unchecked Return Value:

   • The return value of str2ba(bdstr_addr, &addr.l2_bdaddr) is not checked, which could lead to unexpected behavior if the function fails.

3. Potential Buffer Overflow:

   • The bzero(buf, size) function does not check if size is within the bounds of the allocated memory for buf, potentially leading to a buffer overflow.

4. Lack of Input Validation:

   • The function does not validate the input bdstr_addr and maxsize, possibly leading to unexpected behavior or crashes if invalid inputs are provided.

5. Resource Leaks:

   • The socket sock is not closed in case of errors, which can lead to resource leaks.

From usage Function in bss.c

1. Buffer Overflow:

   • The strcpy function used to copy strings into strcode may cause a buffer overflow if a string longer than BUFCODE characters is copied.

2. Null Pointer Dereference:

   • If strcode is NULL in the default case, it can lead to a null pointer dereference if the function attempts to use it.

From General Code in bss.c

1. Buffer Overflow:

   • The strncpy function could still cause a buffer overflow if argv[i] is longer than 18 characters due to unbounded length.

2. Unvalidated User Input:

   • User input converted using atoi is not validated, leading to undefined behavior if the input is not a valid integer.

3. Lack of Error Handling:

   • The return values of l2dos and l2fuzz functions are not checked, hence failures are not handled appropriately.

4. Privilege Escalation:

   • The program checks if the user is root, but a non-root user can exploit setuid root programs.

5. Code Quality:

   • The code is difficult to read and maintain due to complex logic and lack of comments.

From replay_packet/replay_l2cap_packet.c

1. Potential Issues:
   • The code can be improved by checking the result of str2ba.
   • Proper handling for send(sock, replay_buggy_packet, SIZE, 0)) for error cases should be added.

From doc/reset_display_KV600i.c

1. Buffer Overflow:

   • The buffer is filled with 'A' characters using memset, which may lead to a buffer overflow if SIZE is large.

2. Unvalidated User Input:

   • The input argv[1] is not validated before setting addr.l2_bdaddr.

3. Magic Numbers:

   • Usage of magic numbers such as FAKE_SIZE and SIZE without explanation.

4. Missing Error Checking:

   • The return value of str2ba is not checked which might lead to unexpected behavior.

5. Resource Leak:

   • Resources like sock and buffer are not released if an exit call is reached, leading to resource leaks.