jacob.eva/arduino-esp32
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

WebServer: Fix OOB write (#4088)

Browse Source 
Successful exploitation could lead to arbitrary code execution.

The bug can be reproduced by running the following in a browser:
```
const formData = new FormData();
for (let i = 0;i < 33;++i) { formData.append("foo", i.toString()); }
await fetch("http://esp.local", { method: 'POST', body: formData });
```
This commit is contained in:
Emil Sandstø 2020-09-30 14:28:28 +02:00 committed by GitHub
parent 2fd3d042b2
commit 494061af26
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
libraries/WebServer/src/Parsing.cpp
View File

@ -413,6 +413,9 @@ bool WebServer::_parseForm(WiFiClient& client, String boundary, uint32_t len){
if (line == ("--"+boundary+"--")){ if (line == ("--"+boundary+"--")){
log_v("Done Parsing POST"); log_v("Done Parsing POST");
break; break;
} else if (_postArgsLen >= WEBSERVER_MAX_POST_ARGS) {
log_e("Too many PostArgs (max: %d) in request.", WEBSERVER_MAX_POST_ARGS);
return false;
} }
} else { } else {
_currentUpload.reset(new HTTPUpload()); _currentUpload.reset(new HTTPUpload());