Re: [Full-disclosure] Fwd: VSFTPD Remote Heap Overrun (low severity)

[Ramon de C Valle <rcvalle@xxxxxxxxxx>]

> Ramon, not sure I understand, what are you trying to prevent here?
Hello Dan, vsftpd processes open locale files from the "/usr/share/zoneinfo" 
directory, which are expected to have the "locale_t" type. A chrooted user can 
create a specially-crafted locale file in "/home/<user>/usr/share/zoneinfo" 
directory to try exploiting this glibc vulnerability. However, the 
specially-crafted locale file created will have the "user_home_t" type and not 
the "locale_t". SELinux rules for vsftpd (i.e. ftpd_t) allowing only opening 
locale files from "usr_t" directories with "locale_t" type should have 
completely mitigated this.

-- 
Ramon de C Valle / Red Hat Security Response Team

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