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Merge pull request #250 from Fist0urs/13100_fix_overflow

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-m 13100 Fix overflow in input hash parsing
This commit is contained in:
Jens Steube 2016-03-02 10:43:52 +01:00
commit 79efecf56d
1 changed files with 3 additions and 3 deletions
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6
src/shared.c
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@ -18832,8 +18832,10 @@ int krb5tgs_parse_hash (char *input_buf, uint input_len, hash_t *hash_buf)
char *edata_ptr = (char *) krb5tgs->edata2; char *edata_ptr = (char *) krb5tgs->edata2;
krb5tgs->edata2_len = (data_len - 32) / 2 ;
/* skip '$' */ /* skip '$' */
for (uint i = 16 * 2 + 1; i < input_len; i += 2) for (uint i = 16 * 2 + 1; i < (krb5tgs->edata2_len * 2) + (16 * 2 + 1); i += 2)
{ {
const char p0 = data_pos[i + 0]; const char p0 = data_pos[i + 0];
const char p1 = data_pos[i + 1]; const char p1 = data_pos[i + 1];
@ -18844,8 +18846,6 @@ int krb5tgs_parse_hash (char *input_buf, uint input_len, hash_t *hash_buf)
/* this is needed for hmac_md5 */ /* this is needed for hmac_md5 */
*edata_ptr++ = 0x80; *edata_ptr++ = 0x80;
krb5tgs->edata2_len = (data_len - 32) / 2 ;
salt->salt_buf[0] = krb5tgs->checksum[0]; salt->salt_buf[0] = krb5tgs->checksum[0];
salt->salt_buf[1] = krb5tgs->checksum[1]; salt->salt_buf[1] = krb5tgs->checksum[1];
salt->salt_buf[2] = krb5tgs->checksum[2]; salt->salt_buf[2] = krb5tgs->checksum[2];