CVE-1999-0347

Internet Explorer 4.01 allows remote attackers to read local files and spoof web pages via a "%01" character in an "about:" Javascript URL, which causes…

published February 4, 2000

CVSS
—
EPSS
7%
Percentile
94.5
In the wild
Unconfirmed
What it is

⚠️ A sneaky character is the entire exploit! A remote attacker can issue a crafted "about:" URL with a sneaky "%01" that tricks Internet Explorer into reading local files — like a magician pulling a rabbit out of a hat! 🎩 Imagine a librarian who can be convinced to fetch any book just by using a secret code hidden in a casual conversation. This vulnerability allows attackers to create a pathway to local files just by manipulating what’s behind that mischievous character in the URL. If exploited, an attacker could read sensitive local files on the victim's machine. This could lead to the exposure of private information or even the ability to spoof web pages, tricking users into believing what they see is legitimate. Talk about a recipe for disaster!

Put simply

Imagine a librarian who can be convinced to fetch any book just by using a secret code hidden in a casual conversation. This vulnerability allows attackers to create a pathway to local files just by manipulating what’s behind that mischievous character in the URL. This vulnerability in Internet Explorer 4.01 allows remote attackers to read local files by using a crafted JavaScript URL that includes the "%01" character, which redirects requests to untrusted domains.

What to do

If exploited, an attacker could read sensitive local files on the victim's machine. This could lead to the exposure of private information or even the ability to spoof web pages, tricking users into believing what they see is legitimate. Talk about a recipe for disaster! While this vulnerability is not currently known to be exploited, it’s wise to stop using outdated versions of Internet Explorer. Consider upgrading to more secure browsers or applying any relevant security patches. You've got this! Stay vigilant, and keep your systems updated to protect against sneaky vulnerabilities like this one! 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.07463 · 94.5th percentile
Published
2000-02-04T05:00Z
EPSS history
Timeline
  • 04 FEB 05:00Z
    Internet Explorer 4.01 allows remote attackers to read local files and spoof web pages via a "%01" character in an "about:" Javascript URL, which causes…
    cvelistv5