Vulnerability in Squid Proxy Server Affects Request Handling
CVE-2019-12520

7.5HIGH

Key Information:

Vendor

Squid-cache

Status
Squid
Vendor
CVE Published:
15 April 2020

What is CVE-2019-12520?

A vulnerability in Squid Proxy Server, present in versions 4.7 through 5, allows an attacker to exploit the way requests are cached. The issue arises when an absolute URL, which may inadvertently include decoded UserInfo (username and password), is processed. An attacker can craft a request with an encoded username containing special characters, misleading Squid into serving its HTML instead of the legitimate content from the target domain. This manipulation is particularly concerning for Squid servers used as reverse proxies, enabling unauthorized access to sensitive features exclusive to reverse proxy operations.

References

http://www.squid-cache.org/Versions/v4/
x_refsource_MISC
http://www.squid-cache.org/Versions/v4/changesets/
x_refsource_MISC
https://github.com/squid-cache/squid/commits/v4
x_refsource_MISC

EPSS Score

6% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.