Digest Authentication Vulnerability in Squid Proxy by Squid Software
CVE-2020-11945

9.8CRITICAL

Key Information:

Vendor

Squid-cache

Status
Squid
Vendor
CVE Published:
23 April 2020

What is CVE-2020-11945?

A vulnerability in Squid Proxy before version 5.0.2 allows remote attackers to exploit a flaw in the Digest Authentication mechanism. By replaying a captured nonce, attackers may gain unauthorized access to restricted resources. This security lapse arises from the ability to overflow the nonce reference counter, leading to a situation where freed pooled token credentials might be misused for remote code execution.

References

http://www.squid-cache.org/Versions/v4/changesets/squid-4...
x_refsource_MISC
http://master.squid-cache.org/Versions/v4/changesets/squi...
x_refsource_MISC
https://github.com/squid-cache/squid/pull/585
x_refsource_MISC

EPSS Score

32% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.