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Ubuntu 18.04: Critical PHP HTTP Denial of Service Issues USN-7645-1

ubuntu
Calendar Grey July 18, 2025
Dist Ubuntu Esm H88
Major vulnerabilities in PHP patched in Ubuntu versions impacting LTS 16.04 and 18.04. Updating is advised for enhanced security.
Several security issues were fixed in PHP.

Summary

Several security issues were fixed in PHP.

Software Description:

- php7.2: HTML-embedded scripting language interpreter

- php7.0: HTML-embedded scripting language interpreter

Details:

It was discovered that PHP incorrectly parsed certain HTTP response

headers. An attacker could possibly use this issue to cause incorrect

MIME type parsing which could result in unexpected behavior.

(CVE-2025-1217)

It was discovered that PHP did not properly validate certain HTTP

headers. An attacker could possibly use this issue to perform an HTTP

request smuggling attack. (CVE-2025-1734)

It was discovered that PHP did not properly validate certain HTTP

headers. An attacker could possibly use this issue to prevent certain

headers from being sent which could result in a denial of service or

other unexpected behavior. (CVE-2025-1736)

It was discovered that PHP incorrectly performed URL truncation. An

attacker could possibly use this issue to specially craft a URL that

would result in unintended r...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service php Ubuntu important HTTP issue

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS
  libapache2-mod-php7.2           7.2.24-0ubuntu0.18.04.17+esm8
                                  Available with Ubuntu Pro
  libphp7.2-embed                 7.2.24-0ubuntu0.18.04.17+esm8
                                  Available with Ubuntu Pro
  php7.2-cgi                      7.2.24-0ubuntu0.18.04.17+esm8
                                  Available with Ubuntu Pro
  php7.2-cli                      7.2.24-0ubuntu0.18.04.17+esm8
                                  Available with Ubuntu Pro
  php7.2-fpm                      7.2.24-0ubuntu0.18.04.17+esm8
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  libapache2-mod-php7.0           7.0.33-0ubuntu0.16.04.16+esm15
                                  Available with Ubuntu Pro
  libphp7.0-embed                 7.0.33-0ubuntu0.16.04.16+esm15
                                  Available with Ubuntu Pro
  php7.0-cgi                      7.0.33-0ubuntu0.16.04.16+esm15
                                  Available with Ubuntu Pro
  php7.0-cli                      7.0.33-0ubuntu0.16.04.16+esm15
                                  Available with Ubuntu Pro
  php7.0-fpm                      7.0.33-0ubuntu0.16.04.16+esm15
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-7645-1

CVE-2025-1217, CVE-2025-1734, CVE-2025-1736, CVE-2025-1861

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7645-1

Topics%20covered

Topics Covered

security advisory denial of service php Ubuntu important HTTP issue

Package Information

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