CVE-2004-0847

The Microsoft .NET forms authentication capability for ASP.NET allows remote attackers to bypass authentication for .aspx files in restricted directories via a…

published October 6, 2004

Patch now

High probability of exploitation

NVD has not assigned a CVSS score to this record. It sits in the 99.5th percentile for exploit probability.

CVSS
—
EPSS
76%
Percentile
99.5
In the wild
Unconfirmed
What it is

⚠️ A sneaky backslash is all it takes! This vulnerability in Microsoft .NET forms authentication lets remote attackers bypass authentication on restricted .aspx files — like a clever magician pulling off a trick right under your nose! 🔥 Think of it like a restaurant that only allows guests with a reservation, but a cunning diner discovers a way to sneak in by simply mentioning a special code — not even the staff notices! An attacker could access sensitive .aspx files without authentication, leading to unauthorized access to potentially private data. This could expose critical systems and compromise user privacy, making the vulnerability surprisingly dangerous despite it being a bit older!

Put simply

Think of it like a restaurant that only allows guests with a reservation, but a cunning diner discovers a way to sneak in by simply mentioning a special code — not even the staff notices! This path validation vulnerability allows remote attackers to bypass authentication by including a backslash or its encoded version in their requests, targeting ASP.NET applications with improper path handling.

What to do

An attacker could access sensitive .aspx files without authentication, leading to unauthorized access to potentially private data. This could expose critical systems and compromise user privacy, making the vulnerability surprisingly dangerous despite it being a bit older! To remediate this, ensure you’re using a security patch that addresses this issue and validate input paths correctly. Review all .aspx file permissions and configurations for your ASP.NET applications to tighten security. You’ve got the power to lock this down! Follow these steps, and you'll boost your security in no time! 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.75702 · 99.5th percentile
Published
2004-10-06T04:00Z
EPSS history
Timeline
  • 06 OCT 04:00Z
    The Microsoft .NET forms authentication capability for ASP.NET allows remote attackers to bypass authentication for .aspx files in restricted directories via a…
    cvelistv5