Summary
HestiaCP contains an authorization bypass that can allow a non-root administrator to perform write actions while impersonating the protected ROOT_USER account. When the affected cron-management request is accepted without enforcing its read-only restriction, the attacker may cause commands to run under the protected administrator's system account.
HestiaCP contains an authorization bypass that can allow a non-root administrator to perform write actions while impersonating the protected ROOT_USER account. When the affected cron-management request is accepted without enforcing its read-only restriction, the attacker may cause commands to run under the protected administrator's system account.
Affected context
The issue affects HestiaCP deployments where a non-ROOT_USER administrator can use the account-impersonation functionality and reach the cron-management interface. Risk arises when authorization state, including the read-only restriction, is not consistently enforced before write operations are processed.
The issue affects HestiaCP deployments where a non-ROOT_USER administrator can use the account-impersonation functionality and reach the cron-management interface. Risk arises when authorization state, including the read-only restriction, is not consistently enforced before write operations are processed.
Exploit preconditions
- Attack surface: HestiaCP administrative web interface and cron-management endpoint
- Required access: Authenticated access as a non-ROOT_USER administrator with access to account impersonation
- Trigger point: A write request handled by the cron-management functionality while operating in an impersonated ROOT_USER context
- Why exploitation is possible: The application does not adequately enforce the read-only authorization flag before accepting the write action, allowing a lower-privileged administrator to create or modify cron activity associated with the protected account
- Attack surface: HestiaCP administrative web interface and cron-management endpoint
- Required access: Authenticated access as a non-ROOT_USER administrator with access to account impersonation
- Trigger point: A write request handled by the cron-management functionality while operating in an impersonated ROOT_USER context
- Why exploitation is possible: The application does not adequately enforce the read-only authorization flag before accepting the write action, allowing a lower-privileged administrator to create or modify cron activity associated with the protected account
Why this happens
The underlying flaw is an authorization state-validation failure. HestiaCP permits an impersonated session to reach a write-capable operation without verifying that the session is restricted to read-only behavior. This maps to CWE-863: Incorrect Authorization, because the application fails to enforce the intended privilege boundary for a sensitive action and treats an impersonated identity as sufficient authority.
The underlying flaw is an authorization state-validation failure. HestiaCP permits an impersonated session to reach a write-capable operation without verifying that the session is restricted to read-only behavior. This maps to CWE-863: Incorrect Authorization, because the application fails to enforce the intended privilege boundary for a sensitive action and treats an impersonated identity as sufficient authority.
Potential impact
- An attacker may create or modify scheduled tasks associated with the protected administrator
- Commands could run under the ROOT_USER system account
- The attacker could gain elevated control over the hosting server
- Hosted websites, accounts, or data may be modified or compromised
- The affected system could be used for persistence or further compromise
- An attacker may create or modify scheduled tasks associated with the protected administrator
- Commands could run under the ROOT_USER system account
- The attacker could gain elevated control over the hosting server
- Hosted websites, accounts, or data may be modified or compromised
- The affected system could be used for persistence or further compromise
General mitigation guidance
Mitigation generally focuses on enforcing authorization independently for every sensitive write operation.
Common defensive patterns include:
- Apply deny-by-default authorization checks at the cron-management service boundary
- Treat impersonated sessions as read-only unless an explicitly authorized elevation path is present
- Validate the effective actor, target account, and requested operation before processing writes
- Avoid relying solely on UI restrictions or client-controlled flags
- Separate administrative identities and service-account privileges where possible
- Run scheduled tasks with the minimum operating-system permissions required
- Record and alert on privileged cron changes and account-impersonation activity
Mitigation generally focuses on enforcing authorization independently for every sensitive write operation.
Common defensive patterns include:
- Apply deny-by-default authorization checks at the cron-management service boundary
- Treat impersonated sessions as read-only unless an explicitly authorized elevation path is present
- Validate the effective actor, target account, and requested operation before processing writes
- Avoid relying solely on UI restrictions or client-controlled flags
- Separate administrative identities and service-account privileges where possible
- Run scheduled tasks with the minimum operating-system permissions required
- Record and alert on privileged cron changes and account-impersonation activity
How teams detect issues like this
Organizations can look for this class of issue through:
- Static analysis rules that identify write handlers missing centralized authorization checks
- Code review signals involving impersonation, effective-user changes, and client-controlled read-only indicators
- Tests that verify every privileged endpoint rejects writes from read-only or delegated sessions
- Policy enforcement requiring server-side authorization decisions for administrative actions
- Audit-log monitoring for unexpected cron changes performed through impersonated administrator sessions
- Automated security review tools that model authorization across alternate identity and privilege states
Organizations can look for this class of issue through:
- Static analysis rules that identify write handlers missing centralized authorization checks
- Code review signals involving impersonation, effective-user changes, and client-controlled read-only indicators
- Tests that verify every privileged endpoint rejects writes from read-only or delegated sessions
- Policy enforcement requiring server-side authorization decisions for administrative actions
- Audit-log monitoring for unexpected cron changes performed through impersonated administrator sessions
- Automated security review tools that model authorization across alternate identity and privilege states
