![]() Which MIB do I use for interface counters?Ī.Interface management over SNMP is based on two tables: ifTable and its extension, ifXTable described in RFC1213/RFC2233. If you want to know more about integer overflows, we recommend having a look at the extensive Phrack article by blexim.Note: Only registered Cisco users can access internal Cisco tools and information. Unfortunately, enforcing the use of this library in all your code for all arithmetic operations may not be easy. In the case of C++ programs, there is a library called SafeInt that performs safe operations. In the case of the GCC compiler, there are built-in functions that check for integer overflows. The only way to discover them is to examine the operands before the operation or examine the result after (for example, checking whether the addition result for two positive numbers is smaller than the operands).ĭepending on the language, you may be able to come across libraries or mechanisms that help you prevent and discover integer overflows. There is no error, there is no warning, you simply get a wrong result of the operation. The biggest issue with even the most basic integer overflows is that they are very hard to discover and prevent. The subsequent loop causes a heap buffer overflow, which may, in turn, be used by an attacker to execute arbitrary code. ![]() Therefore, xmalloc() receives and allocates a 0-byte buffer. If nresp is 1073741824 and sizeof(char*) is 4 (which is typical), then nresp*sizeof(char*) results in an overflow.
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