Akkariin/proxychains-ng
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Code Issues Releases Wiki Activity

avoid crash if input is too long

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when %s with no width specifier is used in scanf,
a buffer overflow is triggered if the input is longer
than the destination array.
fix this misbehaviour by adding a width specifier to every
occurrence.

Signed-off-by: Antonio Quartulli <a@unstable.cc>
This commit is contained in:
Antonio Quartulli 2017-08-23 22:57:20 +08:00
parent ab6b1733be
commit 4c54503f4a
1 changed files with 5 additions and 5 deletions
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10
src/libproxychains.c
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@ -191,7 +191,7 @@ static void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_typ
pd[count].ps = PLAY_STATE;
port_n = 0;
int ret = sscanf(buff, "%s %s %d %s %s", type, host, &port_n, pd[count].user, pd[count].pass);
int ret = sscanf(buff, "%1023s %1023s %d %255s %255s", type, host, &port_n, pd[count].user, pd[count].pass);
if(ret < 3 || ret == EOF) {
inv:
fprintf(stderr, "error: invalid item in proxylist section: %s", buff);
@ -230,18 +230,18 @@ static void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_typ
} else if(strstr(buff, "round_robin_chain")) {
*ct = ROUND_ROBIN_TYPE;
} else if(strstr(buff, "tcp_read_time_out")) {
sscanf(buff, "%s %d", user, &tcp_read_time_out);
sscanf(buff, "%1023s %d", user, &tcp_read_time_out);
} else if(strstr(buff, "tcp_connect_time_out")) {
sscanf(buff, "%s %d", user, &tcp_connect_time_out);
sscanf(buff, "%1023s %d", user, &tcp_connect_time_out);
} else if(strstr(buff, "remote_dns_subnet")) {
sscanf(buff, "%s %u", user, &remote_dns_subnet);
sscanf(buff, "%1023s %u", user, &remote_dns_subnet);
if(remote_dns_subnet >= 256) {
fprintf(stderr,
"remote_dns_subnet: invalid value. requires a number between 0 and 255.\n");
exit(1);
}
} else if(strstr(buff, "localnet")) {
if(sscanf(buff, "%s %21[^/]/%15s", user, local_in_addr_port, local_netmask) < 3) {
if(sscanf(buff, "%1023s %21[^/]/%15s", user, local_in_addr_port, local_netmask) < 3) {
fprintf(stderr, "localnet format error");
exit(1);
}