Debian: DLA-3810-1 Moderate Security Issues in PHP Cookie Handling

CVE-2024-2756

Marco Squarcina discovered that network and same-site attackers can
set a standard insecure cookie in the victim's browser which is
treated as a `__Host-` or `__Secure-` cookie by PHP applications.

This issue stems from an incomplete fix to CVE-2022-31629.

CVE-2024-3096

Eric Stern discovered that if a password stored with password_hash()
starts with a null byte (\x00), testing a blank string as the
password via password_verify() incorrectly returns true.

If a user were able to create a password with a leading null byte
(unlikely, but syntactically valid), the issue would allow an
attacker to trivially compromise the victim's account by attempting
to sign in with a blank string.

For Debian 10 buster, these problems have been fixed in version
7.3.31-1~deb10u6.

We recommend that you upgrade your php7.3 packages.

For the detailed security status of php7.3 please refer to
its security tracker page at: