CVE-2020-11945
Critical
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).
SeverityCritical
CVSS9.8
Exploit probability—
Product
Squid
PublishedApr 23, 2020
First seenApr 23, 2020
How to fix
Update
- squid-cache squid4.11, 5.0.2 or later
Vendor advisories
- debian.org/security/2020/dsa-4682
- security.gentoo.org/glsa/202005-05
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4FWQRYZJPHAZBLXJ56FPCHJN5X2FP3VA/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RV2VZWFJNO3B56IVN56HHKJASG5DYUIX/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H4MWXEZAJSOGRJSS2JCJK4WBSND4IV46/
- usn.ubuntu.com/4356-1/
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| squid-cache squid | 3.0 ≤ v ≤ 3.5.28, 4.0 ≤ v < 4.11, 5.0 ≤ v < 5.0.2 | 4.11, 5.0.2 |
| debian debian_linux | 9.0, 10.0 | — |
| opensuse leap | 15.1 | — |
| fedoraproject fedora | 30, 31, 32 | — |
| canonical ubuntu_linux | 16.04, 18.04, 19.10, 20.04 | — |
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