Dragonfly vulnerable to timing attacks against Proxy’s basic authentication in d7y.io/dragonfly

Open Source Vulnerabilities CVE-2025-59350

Dragonfly is an open source P2P-based file distribution and image acceleration system. Prior to 2.1.0, the access control mechanism for the Proxy feature uses simple string comparisons and is therefore vulnerable to timing attacks. An attacker may try to guess the password one character at a time by sending all possible characters to a vulnerable mechanism and measuring the comparison instruction’s execution times. This vulnerability is fixed in 2.1.0.

Open Source Vulnerabilities GO-2025-3972

Dragonfly vulnerable to timing attacks against Proxy’s basic authentication in d7y.io/dragonfly

Open Source Vulnerabilities GHSA-c2fc-9q9c-5486

### Impact The access control mechanism for the Proxy feature uses simple string comparisons and is therefore vulnerable to timing attacks. An attacker may try to guess the password one character at a time by sending all possible characters to a vulnerable mechanism and measuring the comparison instruction’s execution times. The vulnerability is shown in figure 8.1, where both the username and password are compared with a short-circuiting equality operation. ```golang if user != proxy.basicAuth.Username || pass != proxy.basicAuth.Password { ``` It is currently undetermined what an attacker may be able to do with access to the proxy password. ### Patches - Dragonfy v2.1.0 and above. ### Workarounds There are no effective workarounds, beyond upgrading. ### References A third party security audit was performed by Trail of Bits, you can see the [full report](https://github.com/dragonflyoss/dragonfly/blob/main/docs/security/dragonfly-comprehensive-report-2023.pdf). If you have any questions or comments about this advisory, please email us at [[email protected]](mailto:[email protected]).