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/libcrypt-u2f-server-perl-0.45/u2f.h
Examining data/libcrypt-u2f-server-perl-0.45/ppport.h
Examining data/libcrypt-u2f-server-perl-0.45/u2f.c

FINAL RESULTS:

data/libcrypt-u2f-server-perl-0.45/ppport.h:7084:14:  [4] (format) vsnprintf:
  If format strings can be influenced by an attacker, they can be exploited,
  and note that sprintf variations do not always \0-terminate (CWE-134). Use
  a constant for the format specification.
    retval = vsnprintf(buffer, len, format, ap);
data/libcrypt-u2f-server-perl-0.45/ppport.h:7086:14:  [4] (format) vsprintf:
  Potential format string problem (CWE-134). Make format string constant.
    retval = vsprintf(buffer, format, ap);
data/libcrypt-u2f-server-perl-0.45/ppport.h:7115:5:  [4] (format) vsprintf:
  Potential format string problem (CWE-134). Make format string constant.
    vsprintf(buffer, pat, args);
data/libcrypt-u2f-server-perl-0.45/u2f.c:70:5:  [4] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf.
    sprintf(errorstring, "error: u2fs_global_init (%d): %s", rc,
data/libcrypt-u2f-server-perl-0.45/u2f.c:83:5:  [4] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf.
    sprintf(errorstring, "error: u2fs_init (%d): %s", rc, u2fs_strerror(rc));
data/libcrypt-u2f-server-perl-0.45/u2f.c:95:7:  [4] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf.
      sprintf(errorstring, "error: u2fs_set_keyHandle (%d): %s", rc,
data/libcrypt-u2f-server-perl-0.45/u2f.c:109:7:  [4] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf.
      sprintf(errorstring, "error: u2fs_set_publicKey (%d): %s", rc,
data/libcrypt-u2f-server-perl-0.45/u2f.c:122:5:  [4] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf.
    sprintf(errorstring, "error: u2fs_set_origin (%d): %s", rc, u2fs_strerror(rc));
data/libcrypt-u2f-server-perl-0.45/u2f.c:133:5:  [4] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf.
    sprintf(errorstring, "error: u2fs_set_appid (%d): %s", rc,
data/libcrypt-u2f-server-perl-0.45/u2f.c:145:7:  [4] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf.
      sprintf(errorstring, "error: u2fs_set_challenge (%d): %s", rc,
data/libcrypt-u2f-server-perl-0.45/u2f.c:157:9:  [4] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf.
        sprintf(errorstring, "error (%d): %s", rc, u2fs_strerror(rc));
data/libcrypt-u2f-server-perl-0.45/u2f.c:168:9:  [4] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf.
        sprintf(errorstring, "error (%d): %s", rc, u2fs_strerror(rc));
data/libcrypt-u2f-server-perl-0.45/u2f.c:181:9:  [4] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf.
        sprintf(errorstring, "error (%d): %s", rc, u2fs_strerror(rc));
data/libcrypt-u2f-server-perl-0.45/u2f.c:205:9:  [4] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf.
        sprintf(errorstring, "Authentication failed: %s", u2fs_strerror(rc));
data/libcrypt-u2f-server-perl-0.45/u2f.c:209:7:  [4] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf.
      sprintf(errorstring, "error: u2fs_authentication_verify (%d): %s", rc,
data/libcrypt-u2f-server-perl-0.45/ppport.h:4025:42:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
#  define CopyD(s,d,n,t)                 memcpy((char*)(d),(char*)(s), (n) * sizeof(t))
data/libcrypt-u2f-server-perl-0.45/ppport.h:6939:38:  [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.
                && (xdigit = strchr((char *) PL_hexdigit, s[1])))
data/libcrypt-u2f-server-perl-0.45/ppport.h:7161:9:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
        memcpy(dst + used, src, copy);
data/libcrypt-u2f-server-perl-0.45/ppport.h:7190:9:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
        memcpy(dst, src, copy);
data/libcrypt-u2f-server-perl-0.45/ppport.h:7282:5:  [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.
    char octbuf[32] = "%123456789ABCDF";
data/libcrypt-u2f-server-perl-0.45/ppport.h:7352:13:  [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.
            char tmp[2];
data/libcrypt-u2f-server-perl-0.45/u2f.c:56:1:  [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.
char errorstring[10000];
data/libcrypt-u2f-server-perl-0.45/u2f.c:57:1:  [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.
char kh[1000];
data/libcrypt-u2f-server-perl-0.45/u2f.c:184:5:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
    memcpy(pk, u2fs_get_registration_publicKey(reg_result), U2FS_PUBLIC_KEY_LEN);
data/libcrypt-u2f-server-perl-0.45/ppport.h:5529:24:  [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).
  sv_vsetpvfn(sv, pat, strlen(pat), args, Null(SV**), 0, Null(bool*));
data/libcrypt-u2f-server-perl-0.45/ppport.h:5537:59:  [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).
#  define sv_vcatpvf(sv, pat, args)  sv_vcatpvfn(sv, pat, strlen(pat), args, Null(SV**), 0, Null(bool*))
data/libcrypt-u2f-server-perl-0.45/ppport.h:5541:59:  [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).
#  define sv_vsetpvf(sv, pat, args)  sv_vsetpvfn(sv, pat, strlen(pat), args, Null(SV**), 0, Null(bool*))
data/libcrypt-u2f-server-perl-0.45/ppport.h:5561:24:  [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).
  sv_vcatpvfn(sv, pat, strlen(pat), &args, Null(SV**), 0, Null(bool*));
data/libcrypt-u2f-server-perl-0.45/ppport.h:5589:24:  [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).
  sv_vcatpvfn(sv, pat, strlen(pat), &args, Null(SV**), 0, Null(bool*));
data/libcrypt-u2f-server-perl-0.45/ppport.h:5610:27:  [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).
     sv_vcatpvfn(sv, pat, strlen(pat), args, Null(SV**), 0, Null(bool*));  \
data/libcrypt-u2f-server-perl-0.45/ppport.h:5632:24:  [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).
  sv_vsetpvfn(sv, pat, strlen(pat), &args, Null(SV**), 0, Null(bool*));
data/libcrypt-u2f-server-perl-0.45/ppport.h:5660:24:  [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).
  sv_vsetpvfn(sv, pat, strlen(pat), &args, Null(SV**), 0, Null(bool*));
data/libcrypt-u2f-server-perl-0.45/ppport.h:5681:27:  [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).
     sv_vsetpvfn(sv, pat, strlen(pat), args, Null(SV**), 0, Null(bool*));  \
data/libcrypt-u2f-server-perl-0.45/ppport.h:5735:65:  [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).
#  define HvNAMELEN_get(hv)              (HvNAME_get(hv) ? (I32)strlen(HvNAME_get(hv)) : 0)
data/libcrypt-u2f-server-perl-0.45/ppport.h:6533:22:  [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).
        STRLEN len = strlen(radix);
data/libcrypt-u2f-server-perl-0.45/ppport.h:7117:12:  [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).
    return strlen(buffer);
data/libcrypt-u2f-server-perl-0.45/ppport.h:7157:12:  [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).
    used = strlen(dst);
data/libcrypt-u2f-server-perl-0.45/ppport.h:7158:14:  [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).
    length = strlen(src);
data/libcrypt-u2f-server-perl-0.45/ppport.h:7187:14:  [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).
    length = strlen(src);
data/libcrypt-u2f-server-perl-0.45/u2f.c:186:5:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120).
    strncpy(kh, u2fs_get_registration_keyHandle(reg_result), 1000);

ANALYSIS SUMMARY:

Hits = 40
Lines analyzed = 7736 in approximately 0.18 seconds (42714 lines/second)
Physical Source Lines of Code (SLOC) = 3289
Hits@level = [0]   0 [1]  16 [2]   9 [3]   0 [4]  15 [5]   0
Hits@level+ = [0+]  40 [1+]  40 [2+]  24 [3+]  15 [4+]  15 [5+]   0
Hits/KSLOC@level+ = [0+] 12.1618 [1+] 12.1618 [2+] 7.29705 [3+] 4.56066 [4+] 4.56066 [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.