Flawfinder version 2.0.10, (C) 2001-2019 David A. Wheeler. Number of rules (primarily dangerous function names) in C/C++ ruleset: 223 Examining data/randmac-0.1/randmac.c FINAL RESULTS: data/randmac-0.1/randmac.c:177:2: [4] (format) printf: If format strings can be influenced by an attacker, they can be exploited (CWE-134). Use a constant for the format specification. printf(printfmt[(eui64 << 1) + uppercase], data/randmac-0.1/randmac.c:135:7: [3] (buffer) getopt_long: Some older implementations do not protect against internal buffer overflows (CWE-120, CWE-20). Check implementation on installation, or limit the size of all string inputs. c = getopt_long(argc, argv, short_options, data/randmac-0.1/randmac.c:155:2: [3] (random) srand: This function is not sufficiently random for security-related functions such as key and nonce creation (CWE-327). Use a more secure technique for acquiring random values. srand(time(NULL) + getpid()); data/randmac-0.1/randmac.c:93:17: [2] (misc) fopen: Check when opening files - can an attacker redirect it (via symlinks), force the opening of special file type (e.g., device files), move things around to create a race condition, control its ancestors, or change its contents? (CWE-362). FILE *stream = fopen(EUICSV, "r"); data/randmac-0.1/randmac.c:121:11: [2] (buffer) char: Statically-sized arrays can be improperly restricted, leading to potential overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use functions that limit length, or ensure that the size is larger than the maximum possible length. unsigned char mac[6]; data/randmac-0.1/randmac.c:107:26: [1] (buffer) strlen: Does not handle strings that are not \0-terminated; if given one it may perform an over-read (it could cause a crash if unprotected) (CWE-126). if (strncmp(s, tail, strlen(s)) == 0) { ANALYSIS SUMMARY: Hits = 6 Lines analyzed = 182 in approximately 0.02 seconds (9685 lines/second) Physical Source Lines of Code (SLOC) = 151 Hits@level = [0] 5 [1] 1 [2] 2 [3] 2 [4] 1 [5] 0 Hits@level+ = [0+] 11 [1+] 6 [2+] 5 [3+] 3 [4+] 1 [5+] 0 Hits/KSLOC@level+ = [0+] 72.8477 [1+] 39.7351 [2+] 33.1126 [3+] 19.8675 [4+] 6.62252 [5+] 0 Dot directories skipped = 1 (--followdotdir overrides) Minimum risk level = 1 Not every hit is necessarily a security vulnerability. There may be other security vulnerabilities; review your code! See 'Secure Programming HOWTO' (https://dwheeler.com/secure-programs) for more information.