medium
5.3
CWE
444
Advisory Published
Updated

CVE-2019-18678

First published: Tue Nov 26 2019(Updated: )

An issue was discovered in Squid 3.x and 4.x through 4.8. It allows attackers to smuggle HTTP requests through frontend software to a Squid instance that splits the HTTP Request pipeline differently. The resulting Response messages corrupt caches (between a client and Squid) with attacker-controlled content at arbitrary URLs. Effects are isolated to software between the attacker client and Squid. There are no effects on Squid itself, nor on any upstream servers. The issue is related to a request header containing whitespace between a header name and a colon.

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Squid-Cache Squid>=3.0<=3.5.28
Squid-Cache Squid>=4.0<=4.8
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=19.04
Canonical Ubuntu Linux=19.10
Debian Debian Linux=8.0
Fedoraproject Fedora=30
Fedoraproject Fedora=31
ubuntu/squid<4.4-1ubuntu2.3
4.4-1ubuntu2.3
ubuntu/squid<4.8-1ubuntu2.1
4.8-1ubuntu2.1
ubuntu/squid<4.9-2ubuntu1
4.9-2ubuntu1
ubuntu/squid<4.9-2ubuntu1
4.9-2ubuntu1
ubuntu/squid<4.9-2ubuntu1
4.9-2ubuntu1
ubuntu/squid<4.9-1
4.9-1
ubuntu/squid3<3.5.27-1ubuntu1.4
3.5.27-1ubuntu1.4
ubuntu/squid3<3.5.12-1ubuntu7.9
3.5.12-1ubuntu7.9
debian/squid
4.6-1+deb10u7
4.6-1+deb10u10
4.13-10+deb11u2
4.13-10+deb11u3
5.7-2
5.7-2+deb12u1
6.6-1
6.9-1

Remedy

https://github.com/squid-cache/squid/pull/445

Remedy

http://www.squid-cache.org/Versions/v4/changesets/squid-4-671ba97abe929156dc4c717ee52ad22fba0f7443.patch

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2019-18678?

    The severity of CVE-2019-18678 is medium with a severity value of 5.3.

  • How does CVE-2019-18678 affect Squid?

    CVE-2019-18678 affects Squid versions 3.x and 4.x through 4.8.

  • What is the impact of CVE-2019-18678?

    CVE-2019-18678 allows attackers to smuggle HTTP requests through frontend software to a Squid instance, corrupting caches with attacker-controlled data.

  • How can I fix CVE-2019-18678 on Ubuntu?

    To fix CVE-2019-18678 on Ubuntu, update the Squid package to version 4.9-2ubuntu1 or higher.

  • How can I fix CVE-2019-18678 on Debian?

    To fix CVE-2019-18678 on Debian, update the Squid package to version 4.6-1+deb10u7 or higher.

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