Buffer overflow in Squid-Cache Squid
CVE-2019-12526
An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based buffer overflow. When receiving data from a remote server in response to an URN request, Squid fails to ensure that the response can fit within the buffer. This leads to attacker controlled data overflowing in the heap.
Vulnerability class: Buffer 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: 0.203 (97.4th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.203 · newest: 0.203 · change: 0.000
Affected products
- Squid-Cache Squid
- Canonical Ubuntu Linux — versions 16.04, 18.04, 19.04
- Debian Linux — versions 8.0, 9.0, 10.0
- Fedoraproject Fedora — versions 30, 31
- openSUSE Leap — versions 15.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.suse.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- www.squid-cache.org/Advisories/SQUID-2019_7.txt (Third Party Advisory)
- 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, Mailing List, Third Party Advisory)
- security.gentoo.org/glsa/202003-34 (vendor-advisory, Third Party Advisory)
- www.debian.org/security/2020/dsa-4682 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2020/07/msg00009.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-12526?
- CVE-2019-12526 is a critical-severity vulnerability in Squid-Cache Squid, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2019-11-26.
- How severe is CVE-2019-12526?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2019-12526 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.