USN-6483-1: HTML Tidy vulnerability

Releases

• Ubuntu 23.10
• Ubuntu 23.04
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS

Packages

• tidy-html5 - HTML/XML syntax checker and reformatter

Details

Neeraj Pal discovered that HTML Tidy incorrectly handled parsing certain
HTML data. If a user or automated system were tricked into parsing
specially crafted HTML data, a remote attacker could cause HTML Tidy to
consume resources, leading to a denial of service, or possibly execute
arbitrary code.

Update instructions

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

Ubuntu 23.10

• libtidy5deb1 - 2:5.6.0-11ubuntu0.23.10.1
• tidy - 2:5.6.0-11ubuntu0.23.10.1

Ubuntu 23.04

• libtidy5deb1 - 2:5.6.0-11ubuntu0.23.04.1
• tidy - 2:5.6.0-11ubuntu0.23.04.1

Ubuntu 22.04

• libtidy5deb1 - 2:5.6.0-11ubuntu0.22.04.1
• tidy - 2:5.6.0-11ubuntu0.22.04.1

Ubuntu 20.04

• libtidy5deb1 - 2:5.6.0-11ubuntu0.20.04.1
• tidy - 2:5.6.0-11ubuntu0.20.04.1

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

References

• CVE-2021-33391