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10.0
HIGH CVSS 2.0
CVE-2005-0194
Squid Remote Authentication Bypass Vulnerability
Description

Squid 2.5, when processing the configuration file, parses empty Access Control Lists (ACLs), including proxy_auth ACLs without defined auth schemes, in a way that effectively removes arguments, which could allow remote attackers to bypass intended ACLs if the administrator ignores the parser warnings.

INFO

Published Date :

May 2, 2005, 4 a.m.

Last Modified :

April 3, 2025, 1:03 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Affected Products

The following products are affected by CVE-2005-0194 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Squid squid
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 2.0 HIGH [email protected]
Solution
This vulnerability allows remote attackers to bypass intended access control lists. Updating Squid to the latest version will address this issue.
  • Update the Squid package to the latest version.
  • Review and correct any proxy_auth ACL configurations.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2005-0194.

URL Resource
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000923 Patch
http://fedoranews.org/updates/FEDORA--.shtml
http://marc.info/?l=bugtraq&m=110901183320453&w=2
http://www.debian.org/security/2005/dsa-667 Patch Vendor Advisory
http://www.kb.cert.org/vuls/id/260421 Patch Third Party Advisory US Government Resource
http://www.squid-cache.org/Versions/v2/2.5/bugs/#squid-2.5.STABLE7-empty_acls Patch
http://www.squid-cache.org/Versions/v2/2.5/bugs/squid-2.5.STABLE7-empty_acls.patch Patch
http://www.squid-cache.org/bugs/show_bug.cgi?id=1166 Vendor Advisory
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000923 Patch
http://fedoranews.org/updates/FEDORA--.shtml
http://marc.info/?l=bugtraq&m=110901183320453&w=2
http://www.debian.org/security/2005/dsa-667 Patch Vendor Advisory
http://www.kb.cert.org/vuls/id/260421 Patch Third Party Advisory US Government Resource
http://www.squid-cache.org/Versions/v2/2.5/bugs/#squid-2.5.STABLE7-empty_acls Patch
http://www.squid-cache.org/Versions/v2/2.5/bugs/squid-2.5.STABLE7-empty_acls.patch Patch
http://www.squid-cache.org/bugs/show_bug.cgi?id=1166 Vendor Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2005-0194 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2005-0194 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2005-0194 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2005-0194 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 20, 2024

    Action Type Old Value New Value
    Added Reference http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000923
    Added Reference http://fedoranews.org/updates/FEDORA--.shtml
    Added Reference http://marc.info/?l=bugtraq&m=110901183320453&w=2
    Added Reference http://www.debian.org/security/2005/dsa-667
    Added Reference http://www.kb.cert.org/vuls/id/260421
    Added Reference http://www.squid-cache.org/bugs/show_bug.cgi?id=1166
    Added Reference http://www.squid-cache.org/Versions/v2/2.5/bugs/#squid-2.5.STABLE7-empty_acls
    Added Reference http://www.squid-cache.org/Versions/v2/2.5/bugs/squid-2.5.STABLE7-empty_acls.patch
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Oct. 18, 2016

    Action Type Old Value New Value
    Removed Reference http://marc.theaimsgroup.com/?l=bugtraq&m=110901183320453&w=2
    Added Reference http://marc.info/?l=bugtraq&m=110901183320453&w=2
  • Initial Analysis by [email protected]

    Jun. 04, 2005

    Action Type Old Value New Value
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 10
Access Vector
Access Complexity
Authentication
Confidentiality Impact
Integrity Impact
Availability Impact
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

1.01 }} -0.68%

score

0.75061

percentile