What’s Vulnerable › Vulnerabilities

CVE-2019-18679

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 41.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-11-26 · updated 2026-06-17
• Weakness: CWE-200

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.

Affected products

• Canonical Ubuntu Linux: 16.04, 18.04, 19.04, 19.10
• Debian Linux: 8.0
• Fedoraproject Fedora: 30, 31
• Squid: from 2.0 through 2.7; from 3.0 through 3.5.28; from 4.0 through 4.8; 2.7-stable2, 2.7-stable3, 2.7-stable4, 2.7-stable5, 2.7-stable6, 2.7-stable7 (+2)

References

• http://www.squid-cache.org/Advisories/SQUID-2019_11.txt
• http://www.squid-cache.org/Versions/v4/changesets/squid-4-671ba97abe929156dc4c717ee52ad22fba0f7443.patch
• https://bugzilla.suse.com/show_bug.cgi?id=1156324
• https://github.com/squid-cache/squid/pull/491
• https://lists.debian.org/debian-lts-announce/2019/12/msg00011.html
• https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/
• https://security.gentoo.org/glsa/202003-34
• https://usn.ubuntu.com/4213-1/
• https://www.debian.org/security/2020/dsa-4682
• http://www.squid-cache.org/Advisories/SQUID-2019_11.txt

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