"Problems this week include root exploits in the MarkVision
printer drivers package, local and remote root exploits in KTH
Kerberos, buffer overflows in Red Hat's PAM, a discussion of
security problems with web-based applications, and an example of
one of these web-based security problems in phpGroupWare."
Kerberos is a network authentication protocol that uses a
secret-key to provide authentication over insecure networks. There
are two primary Kerberos packages: MIT and KTH. KTH Kerberos is
included in OpenBSD and FreeBSD. There are three vulnerabilities in
KTH Kerberos IV: It honors some environmental variables, there is a
buffer overflow in the protocol parsing code, and there is a race
condition in the ticket file writing code. These problems can lead
to local and remote root vulnerabilities."
"Red Hat PAM
There is a problem with the PAM system in Red Hat 7 and an update
that was issued for Red Hat 6.x. Both versions included a module
named pam_localuser. This module is vulnerable to a buffer
overflow. Even though this module is not used by default, Red Hat
has released a new version that fixes the buffer overflow and fixes
some other bugs."