CVE-2018-20721

URI_FUNC() in UriParse.c in uriparser before 0.9.1 has an out-of-bounds read (in uriParse*Ex* functions) for an incomplete URI with an IPv6 address containing…

published January 16, 2019

CVSS
—
EPSS
2%
Percentile
81.1
In the wild
Unconfirmed
What it is

⚠️ A troublesome out-of-bounds read hides in uriParse.c, ready to trip you up if you happen to handle IPv6 addresses with an embedded IPv4 address! 🚀 Think of it like a delivery driver trying to find a house that doesn’t exist on the map; they might end up looking in the wrong neighborhood entirely, causing confusion and delays. It’s all about the address being incomplete and leading to potential misinterpretations! While this vulnerability isn't yet actively exploited, it could lead to unexpected behavior or crashes when handling malformed URIs, disrupting your application’s ability to process requests correctly. Incomplete addresses can leave the door open for mishaps that compromise the reliability of your service.

Put simply

Think of it like a delivery driver trying to find a house that doesn’t exist on the map; they might end up looking in the wrong neighborhood entirely, causing confusion and delays. It’s all about the address being incomplete and leading to potential misinterpretations! The vulnerability arises from an out-of-bounds read in the uriParse*Ex functions of the uriparser library, particularly when dealing with incomplete URIs that include both IPv6 and embedded IPv4 addresses. This can result in incorrect memory access during the parsing process, potentially leading to crashes or unexpected results.

What to do

While this vulnerability isn't yet actively exploited, it could lead to unexpected behavior or crashes when handling malformed URIs, disrupting your application’s ability to process requests correctly. Incomplete addresses can leave the door open for mishaps that compromise the reliability of your service. Upgrade the uriparser library to version 0.9.1 or later to patch this vulnerability. Additionally, review any sections of your code that interface with URI parsing to ensure they handle malformed inputs properly, minimizing the chance of running into this issue again. You've got this! With a quick update, you can keep your application running smoothly and securely. 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.02050 · 81.1th percentile
Published
2019-01-16T14:00Z
EPSS history
Timeline
  • 16 JAN 14:00Z
    URI_FUNC() in UriParse.c in uriparser before 0.9.1 has an out-of-bounds read (in uriParse*Ex* functions) for an incomplete URI with an IPv6 address containing…
    cvelistv5