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CVE-2025-5449 tests: Reproducer for payload length overrun

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Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
This commit is contained in:
Jakub Jelen
2025-04-23 12:46:35 +02:00
committed by Andreas Schneider
parent 926d45b6dd
commit c22bfa792f
1 changed files with 58 additions and 0 deletions
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58
tests/server/torture_sftpserver.c
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@ -1187,6 +1187,61 @@ static void torture_server_sftp_handle_overrun(void **state)
assert_int_equal(rc, SSH_OK);
}
static void torture_server_sftp_payload_overrun(void **state)
{
struct test_server_st *tss = *state;
struct torture_state *s = NULL;
struct torture_sftp *tsftp = NULL;
char name[128] = {0};
sftp_session sftp = NULL;
sftp_file handle = NULL;
ssh_buffer buffer = NULL;
uint32_t id, bad_payload_len = 0x7ffffffc;
int rc;
assert_non_null(tss);
s = tss->state;
assert_non_null(s);
tsftp = s->ssh.tsftp;
assert_non_null(tsftp);
sftp = tsftp->sftp;
assert_non_null(sftp);
/* Open a file for writing */
snprintf(name, sizeof(name), "%s/file", tsftp->testdir);
handle = sftp_open(sftp, name, O_WRONLY | O_CREAT, 0700);
assert_non_null(handle);
/* Craft an malicious SFTP packet trying to write to the file with
* payload_length overrun */
buffer = ssh_buffer_new();
id = sftp_get_new_id(sftp);
assert_non_null(buffer);
rc = ssh_buffer_pack(buffer,
"dbdSqd",
bad_payload_len,
SSH_FXP_WRITE,
id,
handle->handle,
(uint64_t)0,
(uint32_t)0);
assert_int_equal(rc, SSH_OK);
rc = ssh_channel_write(sftp->channel,
ssh_buffer_get(buffer),
ssh_buffer_get_len(buffer));
assert_int_equal(rc, 29);
SSH_BUFFER_FREE(buffer);
/* We do not get answer for this malformed packet -- just kill the
* connection */
ssh_string_free(handle->handle);
free(handle);
}
int torture_run_tests(void) {
int rc;
struct CMUnitTest tests[] = {
@ -1220,6 +1275,9 @@ int torture_run_tests(void) {
cmocka_unit_test_setup_teardown(torture_server_sftp_handle_overrun,
session_setup_sftp,
session_teardown),
cmocka_unit_test_setup_teardown(torture_server_sftp_payload_overrun,
session_setup_sftp,
session_teardown),
};
ssh_init();