diff options
| author | Daniel Stenberg <daniel@haxx.se> | 2017-08-01 17:16:46 +0200 |
|---|---|---|
| committer | ng0 <ng0@infotropique.org> | 2017-08-22 15:29:50 +0000 |
| commit | 96ac91c24ae18ccb5c6c2d6571d14835dc83f608 (patch) | |
| tree | 9a4b782b40ac8f6eb9c0d4815df0847f6f082586 | |
| parent | ba48fd53aca1ad1c3d3a0877215a77da6558663d (diff) | |
| download | gnurl-96ac91c24ae18ccb5c6c2d6571d14835dc83f608.tar.gz gnurl-96ac91c24ae18ccb5c6c2d6571d14835dc83f608.tar.bz2 gnurl-96ac91c24ae18ccb5c6c2d6571d14835dc83f608.zip | |
tftp: reject file name lengths that don't fit
... and thereby avoid telling send() to send off more bytes than the
size of the buffer!
CVE-2017-1000100
Bug: https://curl.haxx.se/docs/adv_20170809B.html
Reported-by: Even Rouault
Credit to OSS-Fuzz for the discovery
| -rw-r--r-- | lib/tftp.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/tftp.c b/lib/tftp.c index 02bd84242..f6f4bce5b 100644 --- a/lib/tftp.c +++ b/lib/tftp.c @@ -5,7 +5,7 @@ * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * - * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al. + * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms @@ -491,6 +491,11 @@ static CURLcode tftp_send_first(tftp_state_data_t *state, tftp_event_t event) if(result) return result; + if(strlen(filename) > (state->blksize - strlen(mode) - 4)) { + failf(data, "TFTP file name too long\n"); + return CURLE_TFTP_ILLEGAL; /* too long file name field */ + } + snprintf((char *)state->spacket.data+2, state->blksize, "%s%c%s%c", filename, '\0', mode, '\0'); |