CVE-2020-24606

high-risk

Published 2020-08-24

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.

Do I need to act?

6.3% chance of exploitation in next 30 days

EPSS score — moderate exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 8.6/10 High

NETWORK / LOW complexity

Affected Products (11)

Squid

Ubuntu Linux

Debian Linux

Fedora

Leap

Affected Vendors

Debian Canonical Squid-Cache Fedoraproject Opensuse

References (28)

Mailing List http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.html

Mailing List http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.html

Patch http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_9.patch

Third Party Advisory https://github.com/squid-cache/squid/security/advisories/GHSA-vvj7-xjgq-g2jg

Mailing List https://lists.debian.org/debian-lts-announce/2020/10/msg00005.html

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...

Third Party Advisory https://security.netapp.com/advisory/ntap-20210219-0007/

Third Party Advisory https://security.netapp.com/advisory/ntap-20210226-0006/

Broken Link https://security.netapp.com/advisory/ntap-20210226-0007/

Third Party Advisory https://usn.ubuntu.com/4477-1/

Third Party Advisory https://usn.ubuntu.com/4551-1/

Third Party Advisory https://www.debian.org/security/2020/dsa-4751

Mailing List http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.html

Mailing List http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.html

Patch http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_9.patch

Third Party Advisory https://github.com/squid-cache/squid/security/advisories/GHSA-vvj7-xjgq-g2jg

Mailing List https://lists.debian.org/debian-lts-announce/2020/10/msg00005.html

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...

and 8 more references

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high-risk

Severity 29/34 · Critical

Exploitability 9/34 · Low

Exposure 16/34 · Moderate