CyberRota Analysis
AI-GeneratedThumbor versions prior to 7.8.0 are vulnerable due to a flaw in HMAC validation that allows attackers to manipulate URLs by exploiting Python's .replace() method, which can lead to unauthorized access to images from unintended domains. This vulnerability could result in exposure of sensitive data or content from malicious sources. Organizations using affected versions of Thumbor should prioritize upgrading to version 7.8.0 or later to mitigate this high-severity risk.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor’s HMAC validation can be bypassed due to the use of Python’s .replace() when removing the signature from the URL before validation. Since .replace() removes all occurrences of the substring, an attacker can insert the same signature multiple times in the URL and manipulate the final URL used for validation. This allows crafting URLs where the validated string differs from the actual requested resource, enabling loading images from unintended domains or paths. This issue is fixed in 7.8.0.