|Bugzilla:||716825: CVE-2011-2495 kernel: /proc/PID/io infoleak|
The MITRE CVE dictionary describes this issue as:
fs/proc/base.c in the Linux kernel before 188.8.131.52 does not properly restrict access to /proc/#####/io files, which allows local users to obtain sensitive I/O statistics by polling a file, as demonstrated by discovering the length of another user's password.
This has been addressed in Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG via https://rhn.redhat.com/errata/RHSA-2011-1212.html, https://rhn.redhat.com/errata/RHSA-2011-1189.html, and https://rhn.redhat.com/errata/RHSA-2011-1253.html. Red Hat Enterprise Linux 4 is now in Production 3 of the maintenance life-cycle, https://access.redhat.com/support/policy/updates/errata/, therefore the fix for this issue is not currently planned to be included in the future updates.
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Red Hat security errata
|MRG Grid for RHEL 6 Server v.2 (kernel-rt)||RHSA-2011:1253||September 12, 2011|
|Red Hat Enterprise Linux EUS (v. 5.6 server) (kernel)||RHSA-2011:1813||December 13, 2011|
|Red Hat Enterprise Linux version 5 (kernel)||RHSA-2011:1212||September 06, 2011|
|Red Hat Enterprise Linux version 6 (kernel)||RHSA-2011:1189||August 23, 2011|
Red Hat would like to thank Vasiliy Kulikov of Openwall for reporting this issue.
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For clarification or corrections please contact the Red Hat Security Response Team.