CVE-2019-12525: canonical ubuntu_linux Out-of-bounds Write
Vulnerability summary
CVE-2019-12525 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in canonical ubuntu_linux. EPSS estimates a 24.40% chance of exploitation in the next 30 days, higher than 97.8% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 15 · Related 8Timeline
- 11-07-2019PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.
CVSS metrics
6 scores · 4 sources · 3 versions- OSV · AlpineEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
24.40%
Chance of exploitation in the next 30 days
Percentile
98%
Versus all other CVEs
30-day change
0.00 pp
From 24.40% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian2 products
- squid< 4.8-1
- debian_linuxEOL8.0 | 9.0 | 10.0
Alpine1 product
- squid≥ 3.3.9, < 4.8-r0
Canonical1 product
- ubuntu_linuxEOL12.04 | 16.04 | 18.04 | 19.04
Fedoraproject1 product
- fedoraEOL29
Opensuse1 product
- leapEOL15.0 | 15.1
Squid-cache1 product
- squid≥ 3.3.9, ≤ 3.5.28 | ≥ 4.0, ≤ 4.7
Ubuntu1 product
- squid3< 3.5.12-1ubuntu7.8 | < 3.5.27-1ubuntu1.3
7 vendors · 8 products
References
19 links- www.squid-cache.org/Versions/v4/changesets/squid-4-7f73e9c5d17664b882ed32590e6af310c247f320.patchX Refsource CONFIRMPatchVendor Advisory
lists.debian.org/debian-lts-announce/2019/07/msg00018.htmlMailing ListX Refsource MLISTThird Party Advisory- lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
Show all 19 references
- lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing ListX Refsource MLISTThird Party Advisory