Structures ipt_replace, compat_ipt_replace, and xt_get_revision are copied from userspace. Fields of these structs that are zero-terminated strings are not checked. When they are used as argument to a format string containing "%s" in request_module(), some sensitive information is leaked to userspace via argument of spawned modprobe process. The first bug was introduced before the git epoch; the second is introduced by 6b7d31fc (v2.6.15-rc1); the third is introduced by 6b7d31fc (v2.6.15-rc1). To trigger the bug one should have CAP_NET_ADMIN. http://marc.info/?l=netfilter&m=129978081009955&w=2 Acknowledgements: Red Hat would like to thank Vasiliy Kulikov of Openwall for reporting this issue.
Proposed patch: http://git.kernel.org/?p=linux/kernel/git/kaber/nf-next-2.6.git;a=commitdiff;h=42eab94fff18cb1091d3501cd284d6bd6cc9c143
Statement: 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. Future kernel updates in Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG may address this flaw.
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=42eab94fff18cb1091d3501cd284d6bd6cc9c143
This issue has been addressed in following products: MRG for RHEL-5 Via RHSA-2011:0500 https://rhn.redhat.com/errata/RHSA-2011-0500.html
This issue has been addressed in following products: Red Hat Enterprise Linux 6 Via RHSA-2011:0542 https://rhn.redhat.com/errata/RHSA-2011-0542.html
This issue has been addressed in following products: Red Hat Enterprise Linux 5 Via RHSA-2011:0833 https://rhn.redhat.com/errata/RHSA-2011-0833.html
This issue has been addressed in following products: Red Hat Enterprise Linux 6.0.Z - Server Only Via RHSA-2011:0883 https://rhn.redhat.com/errata/RHSA-2011-0883.html