Information disclosure in Squid-Cache Squid
CVE-2019-18679
An issue was discovered in Squid 2.x, 3.x, and 4.x through 4.8. Due to incorrect data management, it is vulnerable to information disclosure when processing HTTP Digest Authentication. Nonce tokens contain the raw byte value of a pointer that sits within heap memory allocation. This information reduces ASLR protections and may aid attackers isolating memory areas to target for remote code execution attacks.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.410 (98.6th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.410 · newest: 0.410 · change: 0.000
Affected products
- Squid-Cache Squid — versions 2.7
- Canonical Ubuntu Linux — versions 16.04, 18.04, 19.04
- Debian Linux — versions 8.0
- Fedoraproject Fedora — versions 30, 31
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/squid-cache/squid/pull/491 (Patch, Third Party Advisory)
- bugzilla.suse.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- www.squid-cache.org/Advisories/SQUID-2019_11.txt (Third Party Advisory)
- www.squid-cache.org/Versions/v4/changesets/squid-4-671ba97abe929156dc4c717ee52a… (Release Notes)
- usn.ubuntu.com/4213-1/ (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.debian.org/debian-lts-announce/2019/12/msg00011.html (mailing-list, Third Party Advisory)
- security.gentoo.org/glsa/202003-34 (vendor-advisory)
- www.debian.org/security/2020/dsa-4682 (vendor-advisory)
Frequently asked questions
- What is CVE-2019-18679?
- CVE-2019-18679 is a high-severity vulnerability in Squid-Cache Squid, classified under Information Disclosure. CVSS score: 7.5/10. Published 2019-11-26.
- How severe is CVE-2019-18679?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2019-18679 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.