Discuz! X3.4 X3.3 UC(/uc_server/data/tmp) upload execution vulnerability fixes

Discuz! X3.4 X3.3 UC(/uc_server/data/tmp) upload execution bug fix (Alibaba Cloud hot fix): Introduction: In Discuz, uc_key is the communication key for UC client to communicate with the server. There is a code writing vulnerability in/api/uc.php in discuz, which allows hackers to write malicious code to obtain uckey, and eventually enter the background of the website, causing data leakage.

Bug name:

Discuz uc.key disclosure leads to code injection vulnerability

The webmaster reported: After an existing website was recruited,/uc_server/data/tmp was uploaded to the shell

The path of the vulnerability file reported by the webmaster: /api/uc. php

Manual restoration plan:

Editor:

/api/uc.php

Find: (39 lines)

require_once '../ source/class/class_core.php';

Revise to:

require_once '../ source/class/class_core.php'; if (method_exists("C", "app")) { $discuz = C::app(); $discuz->init(); }

Find: (273 lines)

function updateapps($get, $post) {

Revise to:

function updateapps($get, $post) { if($POST@['UC_API']) { $POST@['UC_API'] = addslashes($POST@['UC_API']); }