Multiple vulnerabilities were found in sssd, a set of daemons to manage access to remote directories and authentication mechanisms, which could lead to privilege escalation.
A new boolean setting
ad_gpo_ignore_unreadable (defaulting to
False) is introduced for environments where attributes in the
groupPolicyContainer are not readable and changing the permissions
on the GPO objects is not possible or desirable. See
It was discovered that if a user was configured with no home
directory set, then
/ (i.e., the root directory)
instead of the empty string (meaning no home directory). This could
impact services that restrict the user's filesystem access to within
their home directory through
chroot() or similar.
It was discovered that the
sssctl(8) command was vulnerable to shell
command injection via the
This flaw could allows an attacker to trick the root user into
running a specially crafted
sssctl(8) command, such as via sudo, in
order to gain root privileges.
It was discovered that
libsss_certmap failed to sanitize certificate
data used in LDAP filters.
PKINIT enables a client to authenticate to the KDC using an X.509 certificate and the corresponding private key, rather than a passphrase or keytab. Mapping rules are used in order to map the certificate presented during a PKINIT authentication request to the corresponding principal. However the mapping filter was found to be vulnerable to LDAP filter injection. As the search result is be influenced by values in the certificate, which may be attacker controlled, this flaw could allow an attacker to gain control of the admin account, leading to full domain takeover.
For Debian 10 buster, these problems have been fixed in version 1.16.3-3.2+deb10u1.
We recommend that you upgrade your sssd packages.
For the detailed security status of sssd please refer to its security tracker page at: https://security-tracker.debian.org/tracker/sssd
Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS