Vulnerability in Squid-Cache Squid
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.052 (92.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.052 · newest: 0.052 · change: 0.000
Affected products
- Squid-Cache Squid
- Canonical Ubuntu Linux — versions 16.04, 18.04, 20.04
- Debian Linux — versions 9.0, 10.0
- Fedoraproject Fedora — versions 31, 32, 33
- openSUSE Leap — versions 15.1, 15.2
Weakness classification (CWE)
References
- github.com/squid-cache/squid/security/advisories/GHSA-vvj7-xjgq-g2jg (Third Party Advisory)
- www.squid-cache.org/Versions/v4/changesets/SQUID-2020_9.patch (Patch, Vendor Advisory)
- www.debian.org/security/2020/dsa-4751 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/4477-1/ (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.html (vendor-advisory, Mailing List, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.html (vendor-advisory, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- usn.ubuntu.com/4551-1/ (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-24606?
- CVE-2020-24606 is a high-severity vulnerability in Squid-Cache Squid, classified under Improper Locking. CVSS score: 8.6/10. Published 2020-08-24.
- How severe is CVE-2020-24606?
- High severity. CVSS v3 base score is 8.6 out of 10.