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| author | Daniel Stenberg <daniel@haxx.se> | 2017-08-01 17:16:46 +0200 |
|---|---|---|
| committer | Daniel Stenberg <daniel@haxx.se> | 2017-08-07 09:24:30 +0200 |
| commit | 358b2b131ad6c095696f20dcfa62b8305263f898 (patch) | |
| tree | 43a86c450eceed59e6afbb1f5a5751782569d0b0 /lib/tftp.c | |
| parent | c9332fa5e84f24da300b42b1a931ade929d3e27d (diff) | |
| download | curl-358b2b131ad6c095696f20dcfa62b8305263f898.tar.gz | |
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
Diffstat (limited to 'lib/tftp.c')
| -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'); |