Home/CVE/Squid before 4.13 and 5.x before 5.0.4 allows a trusted peer to perform Denial of Service by consuming all available CPU
CVE

CVE-2020-24606

Squid before 4.13 and 5.x before 5.0.4 allows a trusted peer to perform Denial of Service by consuming all available CPU

Squid before 4.13 and 5.x before 5.0.4 allows a trusted peer to perform Denial of Service by consuming all available CPU cycles during handling of a crafted Cache Digest response message. This only occurs when cache_peer is used with the cache digests feature. The problem exists because peerDigestHandleReply() livelocking in peer_digest.cc mishandles EOF.

HIGH · CVSS 8.6 EPSS 0.06342
Schedule remediation
  • EPSS percentile: top 9% of all CVEs by exploitation likelihood
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-667Improper Locking
▤

Affected Products & Versions

6
squid-cache squid>= 3.0 and < 4.13
squid-cache squid>= 5.0.1 and < 5.0.4
canonical ubuntu linuxall versions
debian linuxall versions
fedoraproject fedoraall versions
opensuse leapall versions
▣

Scoring & Timeline

8.6
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD24 Aug 2020 · 06:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
⚑

Vendor Advisories

11
suse-csafopenSUSE-SU-2024:11403-1
suse-csafSUSE-SU-2020:14590-1
usnUSN-4551-1
suse-csafopenSUSE-SU-2020:1369-1
suse-csafopenSUSE-SU-2020:1346-1
🔗

References & Sources

14
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.htmlMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.htmlMailing ListThird Party Advisory
http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_9.patchPatchVendor Advisory
https://github.com/squid-cache/squid/security/advisories/GHSA-vvj7-xjgq-g2jgThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00005.htmlMailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BE6FKUN7IGTIR2MEEMWYDT7N5EJJLZI2/
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