CVE-2021-40540

ulfius_uri_logger in Ulfius HTTP Framework before 2.7.4 omits con_info initialization and a con_info->request NULL check for certain malformed HTTP requests

published September 7, 2021

CVSS
—
EPSS
3%
Percentile
85.4
In the wild
Unconfirmed
What it is

⚠️ A seemingly harmless malformed HTTP request might leave your server talking to itself! This trivial oversight in Ulfius could lead to unexpected behaviors. 💡 Think of it as a restaurant that takes orders but forgets to check if the chef is in the kitchen — you could end up serving dishes that don’t make sense! An attacker could send a specially crafted request, potentially causing erratic behavior in your application. While it may not lead to a catastrophic breach, it could result in confusing logs or unexpected server responses, complicating diagnostics or leading to service disruptions.

Put simply

Think of it as a restaurant that takes orders but forgets to check if the chef is in the kitchen — you could end up serving dishes that don’t make sense! The vulnerability in the Ulfius HTTP Framework before version 2.7.4 arises from the omission of a NULL check on the con_info->request object, allowing certain malformed HTTP requests to bypass normal handling procedures.

What to do

An attacker could send a specially crafted request, potentially causing erratic behavior in your application. While it may not lead to a catastrophic breach, it could result in confusing logs or unexpected server responses, complicating diagnostics or leading to service disruptions. To mitigate this issue, upgrade Ulfius to version 2.7.4 or later immediately. Review your server logs for any unusual requests and ensure that your application handles malformed requests appropriately. Consider implementing additional validation checks as a precaution. You've got this! Patch your framework, and wave goodbye to unnecessary chaos! 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.02628 · 85.4th percentile
Published
2021-09-07T01:50Z
EPSS history
Timeline
  • 07 SEP 01:50Z
    ulfius_uri_logger in Ulfius HTTP Framework before 2.7.4 omits con_info initialization and a con_info->request NULL check for certain malformed HTTP requests
    cvelistv5