CWE-135Incorrect Calculation of Multi-Byte String Length

Description

Common consequences· 3

• Integrity / Confidentiality / Availability — Execute Unauthorized Code or Commands
  This weakness may lead to a buffer overflow. Buffer overflows often can be used to execute arbitrary code, which is usually outside the scope of a program's implicit security policy. This can often be used to subvert any other security service.
• Availability / Confidentiality — Read Memory, DoS: Crash, Exit, or Restart, DoS: Resource Consumption (CPU), DoS: Resource Consumption (Memory)
  Out of bounds memory access will very likely result in the corruption of relevant memory, and perhaps instructions, possibly leading to a crash. Other attacks leading to lack of availability are possible, including putting the program into an infinite loop.
• Confidentiality — Read Memory
  In the case of an out-of-bounds read, the attacker may have access to sensitive information. If the sensitive information contains system details, such as the current buffer's position in memory, this knowledge can be used to craft further attacks, possibly with more severe consequences.

Potential mitigations· 2

• [Implementation]Always verify the length of the string unit character.
• [Implementation]Use length computing functions (e.g. strlen, wcslen, etc.) appropriately with their equivalent type (e.g.: byte, wchar_t, etc.)

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.