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CVE-2020-11945

CRITICALCVSS 9.8/10EPSS 27.25%

Last modified

CVE-2020-11945 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. EPSS estimates a 27.25% chance of exploitation in the next 30 days.

Description

An issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. This occurs because the attacker can overflow the nonce reference counter (a short integer). Remote code execution may occur if the pooled token credentials are freed (instead of replayed as valid credentials).

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
27.25%

97.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
Squid-CacheSquid>= 3.0, <= 3.5.28
Squid-CacheSquid>= 4.0, < 4.11
Squid-CacheSquid>= 5.0, < 5.0.2
DebianDebian Linux9.0
DebianDebian Linux10.0
OpensuseLeap15.1
FedoraprojectFedora30
FedoraprojectFedora31
FedoraprojectFedora32
CanonicalUbuntu Linux16.04
CanonicalUbuntu Linux18.04
CanonicalUbuntu Linux19.10
CanonicalUbuntu Linux20.04

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-11945?
An issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. This occurs because the attacker can overflow the nonce reference counter (a short integer). Remote code execution may occur if the pooled token credentials are freed (instead of replayed as valid credentials).
How severe is CVE-2020-11945?
CVE-2020-11945 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 27.25% probability of exploitation in the next 30 days.
How do I fix CVE-2020-11945?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-11945?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST