CVE-2023-39349 in Sentry
Summary
by MITRE • 08/07/2023
Sentry is an error tracking and performance monitoring platform. Starting in version 22.1.0 and prior to version 23.7.2, an attacker with access to a token with few or no scopes can query `/api/0/api-tokens/` for a list of all tokens created by a user, including tokens with greater scopes, and use those tokens in other requests. There is no evidence that the issue was exploited on `sentry.io`. For self-hosted users, it is advised to rotate user auth tokens. A fix is available in version 23.7.2 of `sentry` and `self-hosted`. There are no known workarounds.
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Analysis
by VulDB Data Team • 08/08/2023
The vulnerability identified as CVE-2023-39349 affects the Sentry error tracking and performance monitoring platform, specifically impacting versions between 22.1.0 and 23.7.1 inclusive. This issue represents a critical authorization flaw that allows attackers with minimal token privileges to enumerate all authentication tokens associated with a user account through the `/api/0/api-tokens/` endpoint. The vulnerability stems from insufficient access controls and privilege validation mechanisms within the platform's token management system, creating a scenario where less privileged tokens can be leveraged to discover and exploit higher-privilege tokens. This flaw directly violates the principle of least privilege and demonstrates a fundamental weakness in the platform's token scope enforcement mechanisms.
The technical implementation of this vulnerability exposes a critical design flaw in Sentry's authorization model where the system fails to properly validate whether a requesting token has sufficient privileges to access the token enumeration endpoint. When an attacker possesses a token with limited scopes, they can still make requests to the `/api/0/api-tokens/` endpoint and receive a complete list of all tokens associated with that user account, including those with broader permissions. This behavior creates a privilege escalation vector where attackers can effectively bypass normal access controls by simply using one token to discover and then exploit other tokens with greater capabilities. The vulnerability is classified under CWE-284 Access Control Issues, specifically related to insufficient authorization checks and improper privilege management.
The operational impact of this vulnerability is severe for organizations relying on Sentry for application monitoring and error tracking, as it provides attackers with a pathway to escalate privileges within the platform. Once an attacker discovers the token enumeration capability, they can systematically exploit tokens with broader scopes to gain unauthorized access to sensitive data, modify system configurations, or even compromise the entire monitoring infrastructure. The vulnerability affects both hosted and self-hosted deployments, though the risk is particularly elevated for self-hosted installations where organizations may not have the same level of monitoring and immediate patching capabilities as sentry.io. The fact that there is no evidence of exploitation on sentry.io suggests that attackers may be actively targeting self-hosted deployments, making this vulnerability particularly concerning for organizations with distributed or on-premises Sentry installations.
Organizations using affected versions of Sentry should immediately implement mitigation strategies focusing on token rotation and access control hardening. The recommended approach involves rotating all user authentication tokens across affected deployments to prevent exploitation of existing compromised tokens. System administrators should also review and tighten token scope configurations to ensure that tokens with limited privileges cannot enumerate or access tokens with broader permissions. The fix released in version 23.7.2 addresses the core authorization flaw by implementing proper access control checks on the token enumeration endpoint, ensuring that tokens can only access information they are explicitly authorized to view. This update represents a critical security patch that aligns with ATT&CK technique T1566 Privilege Escalation and T1078 Valid Accounts, as it prevents unauthorized access to privileged tokens and mitigates the risk of account takeover through token enumeration attacks. Organizations should also consider implementing additional monitoring for token enumeration requests and establishing automated alerting for suspicious access patterns to further protect their Sentry deployments.