CVE-2019-18679: canonical ubuntu_linux
Vulnerability summary
CVE-2019-18679 is a high (CVSS 7.5) vulnerability in canonical ubuntu_linux. EPSS estimates a 40.98% chance of exploitation in the next 30 days, higher than 98.6% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 13 · Related 8Timeline
- 26-11-2019PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS trend
Probability
40.98%
Chance of exploitation in the next 30 days
Percentile
99%
Versus all other CVEs
30-day change
0.00 pp
From 40.98% 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< 4.9-1
- debian_linuxEOL8.0
Ubuntu2 products
- squid< 4.9-2ubuntu1
- squid3< 3.5.12-1ubuntu7.9 | < 3.5.27-1ubuntu1.4
Alpine1 product
- squid≥ 2.0, < 4.8-r1 | ≥ 2.0, < 4.9-r0
Canonical1 product
- ubuntu_linuxEOL16.04 | 18.04 | 19.04 | 19.10
Fedoraproject1 product
- fedoraEOL30 | 31
Squid-cache1 product
- squid≥ 2.0, ≤ 2.7 | ≥ 3.0, ≤ 3.5.28 | ≥ 4.0, ≤ 4.8 | 2.7:stable2 | 2.7:stable3 | 2.7:stable4 | 2.7:stable5 | 2.7:stable6 | 2.7:stable7 | 2.7:stable8 | 2.7:stable9
6 vendors · 8 products
References
16 links- www.squid-cache.org/Versions/v4/changesets/squid-4-671ba97abe929156dc4c717ee52ad22fba0f7443.patchX Refsource CONFIRMRelease Notes
lists.debian.org/debian-lts-announce/2019/12/msg00011.htmlMailing ListX Refsource MLISTThird Party Advisory