Integer overflow in Squid-Cache Squid
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).
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.272 (98.0th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.272 · newest: 0.272 · change: 0.000
Affected products
- Squid-Cache Squid
- Canonical Ubuntu Linux — versions 16.04, 18.04, 19.10
- Debian Linux — versions 9.0, 10.0
- Fedoraproject Fedora — versions 30, 31, 32
- openSUSE Leap — versions 15.1
Weakness classification (CWE)
References
- www.squid-cache.org/Versions/v4/changesets/squid-4-eeebf0f37a72a2de08348e85ae34… (Patch, Vendor Advisory)
- master.squid-cache.org/Versions/v4/changesets/squid-4-eeebf0f37a72a2de08348e85a… (Vendor Advisory)
- github.com/squid-cache/squid/pull/585 (Patch, Third Party Advisory)
- github.com/squid-cache/squid/commit/eeebf0f37a72a2de08348e85ae34b02c34e9a811 (Patch, Third Party Advisory)
- www.openwall.com/lists/oss-security/2020/04/23/2 (Mailing List, Third Party Advisory)
- bugzilla.suse.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- www.debian.org/security/2020/dsa-4682 (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html (vendor-advisory, Mailing List, Third Party Advisory)
- security.gentoo.org/glsa/202005-05 (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2020-11945?
- CVE-2020-11945 is a critical-severity vulnerability in Squid-Cache Squid, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2020-04-23.
- How severe is CVE-2020-11945?
- Critical severity. CVSS v3 base score is 9.8 out of 10.