[Pkg-shadow-devel] Bug#1103832: shadow: CVE-2024-56433

[Salvatore Bonaccorso]

Source: shadow
Version: 1:4.13+dfsg1-1
Severity: important
Tags: security upstream
Forwarded: https://github.com/shadow-maint/shadow/issues/1157
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for shadow.

CVE-2024-56433[0]:
| shadow-utils (aka shadow) 4.4 through 4.17.0 establishes a default
| /etc/subuid behavior (e.g., uid 100000 through 165535 for the first
| user account) that can realistically conflict with the uids of users
| defined on locally administered networks, potentially leading to
| account takeover, e.g., by leveraging newuidmap for access to an NFS
| home directory (or same-host resources in the case of remote logins
| by these local network users). NOTE: it may also be argued that
| system administrators should not have assigned uids, within local
| networks, that are within the range that can occur in /etc/subuid.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

Thought this will not really be fixable in code, it depends on how
uids were assigned in within a group of systems form system
administrators. Let's link downstream bugreport and upstream and maybe
they come up with a documentation update reflecting the issue?

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2024-56433
    https://www.cve.org/CVERecord?id=CVE-2024-56433
[1] https://github.com/shadow-maint/shadow/issues/1157

Regards,
Salvatore