Plattform
curl
Komponente
curl
Behoben in
7.51.1
CVE-2016-8617 describes a buffer overflow vulnerability in cURL versions 7.51.0 through 7.51.0. This flaw arises from an insufficient buffer allocation within the base64 encode function when handling large inputs, specifically exceeding 1GB, via the CURLOPT_USERNAME option. Successful exploitation could lead to a denial-of-service condition. A fix is available in cURL version 7.51.0.
The primary impact of CVE-2016-8617 is a denial-of-service (DoS). An attacker capable of crafting a request with a CURLOPT_USERNAME value exceeding 1GB on a 32-bit system can trigger the buffer overflow, potentially crashing the cURL process or the application utilizing it. This could disrupt services relying on cURL for data transfer, such as web servers, automation scripts, or command-line tools. While the CVSS score is LOW, the potential for widespread disruption, especially in environments with numerous applications using cURL, should not be underestimated. The vulnerability's reliance on a specific input parameter and 32-bit architecture limits its immediate exploitability, but older systems or applications that haven't been updated may remain vulnerable.
CVE-2016-8617 is not currently listed on the CISA KEV catalog. Public proof-of-concept exploits for this vulnerability are limited, likely due to the specific conditions required for exploitation (32-bit systems and large input sizes). The vulnerability was disclosed in 2016 and patched shortly thereafter, reducing the likelihood of active exploitation. The low CVSS score and limited public exploit information suggest a low probability of exploitation in the wild.
Systems running 32-bit operating systems and utilizing cURL versions prior to 7.51.0 are at the highest risk. Applications that heavily rely on cURL for authentication or data transfer, particularly those handling user-supplied input for the CURLOPT_USERNAME option, should be prioritized for patching. Legacy systems and environments with limited patching capabilities are also vulnerable.
• linux / server:
ps aux | grep curl | grep -i username | grep -b 1000000000 # Check for curl processes with large username values• generic web:
curl -v --user 'A'$(head -c 1000000000 /dev/urandom) https://example.com # Attempt to trigger the vulnerability (replace example.com)disclosure
Exploit-Status
CVSS-Vektor
The recommended mitigation for CVE-2016-8617 is to upgrade to cURL version 7.51.0 or later. This version includes a fix that correctly allocates the necessary buffer size to prevent the overflow. If upgrading is not immediately feasible, consider implementing input validation to restrict the size of the CURLOPT_USERNAME parameter to a reasonable limit. While a WAF or proxy cannot directly prevent this vulnerability, they can be configured to monitor for unusually large requests to cURL endpoints. There are no specific Sigma or YARA rules readily available for this vulnerability, as it's primarily a coding error rather than a malware-driven exploit.
Actualice a la versión 7.51.0 o superior de cURL para evitar la vulnerabilidad de desbordamiento de búfer. La actualización corrige la asignación incorrecta del búfer en la función de codificación base64, mitigando el riesgo de ejecución de código arbitrario.
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CVE-2016-8617 is a buffer overflow vulnerability in cURL versions 7.51.0 through 7.51.0, triggered by providing over 1GB of data via CURLOPT_USERNAME on 32-bit systems, potentially leading to a denial of service.
You are affected if you are using cURL versions 7.51.0 or earlier, especially on 32-bit systems, and applications are passing large values to CURLOPT_USERNAME.
Upgrade to cURL version 7.51.0 or later to resolve the vulnerability. Input validation on CURLOPT_USERNAME can be used as a temporary workaround.
There is limited evidence of active exploitation in the wild, likely due to the specific conditions required for exploitation and the vulnerability's age.
Refer to the cURL security advisories and release notes for details: https://curl.se/security/.
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