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Date: Tue, 9 Aug 2022 14:50:34 +0300
From: Evgeny Legerov <admin@...ndisco.cc>
To: oss-security@...ts.openwall.com
Subject: Apache mod_dav off-by-one
Hi,
How it happens that Apache process_if_header off-by-one, which has been
mentioned in
The Art of Software Security Assessment (page 420), still remains unpatched?
What am I missing?
The code from Apache 2.4.54:
static dav_error * dav_process_if_header(request_rec *r, dav_if_header
**p_ih)
{
...
while (*list) {
/* List is the entire production (in a uri scope) */
switch (*list) {
...
case 'N':
if (list[1] == 'o' && list[2] == 't') {
if (condition != DAV_IF_COND_NORMAL) {
return dav_new_error(r->pool, HTTP_BAD_REQUEST,
DAV_ERR_IF_MULTIPLE_NOT, 0,
"Invalid \"If:\" header: "
"Multiple \"not\"
entries "
"for the same state.");
}
condition = DAV_IF_COND_NOT;
}
list += 2;
break;
It is not only out of bounds read, dav_fetch_next_token() will write
NULL byte on next iteration.
regards,
-e
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