Xen PV Guest Non-SELFSNOOP CPU Memory Corruption

Xen: PV guest on non-SELFSNOOP CPUs can validate non-coherent L2 pagetable I'm not sure whether there are any major users of unshimmed Xen PV left, but https://xenbits.xen.org/docs/unstable/support-matrix.html says it's still a security-supported usecase for 64-bit guests. Tested on Debian's Xen...

pam_captcha username harvest vulnerability

pamcaptcha is visual text-based CAPTCHA challenge module for PAM that uses figlet to generate the CAPTCHAs. Project site: http://www.semicomplete.com/projects/pamcaptcha/ A site with a screen shot: http://www.michaelboman.org/how-to/securing-ssh-access-with-pam-captcha I found a security problem...