Buffer overflow in Squid-Cache Squid
CVE-2019-12527
An issue was discovered in Squid 4.0.23 through 4.7. When checking Basic Authentication with HttpHeader::getAuth, Squid uses a global buffer to store the decoded data. Squid does not check that the decoded length isn't greater than the buffer, leading to a heap-based buffer overflow with user controlled data.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.490 (98.8th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.490 · newest: 0.490 · change: 0.000
Affected products
- Squid-Cache Squid
- Canonical Ubuntu Linux — versions 16.04, 18.04, 19.04
- Debian Linux — versions 10.0
- Fedoraproject Fedora — versions 29
- Red Hat Enterprise Linux — versions 8.0
- Red Hat Enterprise Linux Eus — versions 8.1, 8.2, 8.4
- Red Hat Enterprise Linux Server Aus — versions 8.2, 8.4, 8.6
- Red Hat Enterprise Linux Server Tus — versions 8.2, 8.4, 8.6
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.squid-cache.org/Versions/v4/changesets/ (Vendor Advisory)
- github.com/squid-cache/squid/commits/v4 (Patch, Third Party Advisory)
- www.squid-cache.org/Versions/v4/changesets/squid-4-7f73e9c5d17664b882ed32590e6a… (Patch, Vendor Advisory)
- www.securityfocus.com/bid/109143 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
- usn.ubuntu.com/4065-1/ (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.debian.org/security/2019/dsa-4507 (vendor-advisory, Third Party Advisory)
- seclists.org/bugtraq/2019/Aug/42 (mailing-list, Mailing List, Third Party Advisory)
- access.redhat.com/errata/RHSA-2019:2593 (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.html (vendor-advisory, Broken Link)
Frequently asked questions
- What is CVE-2019-12527?
- CVE-2019-12527 is a high-severity vulnerability in Squid-Cache Squid, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2019-07-11.
- How severe is CVE-2019-12527?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2019-12527 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.