netdev - Re: [PATCH] netfilter: fix namespace handling in nf_log_proc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Tue, 4 Oct 2016 08:46:53 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Jann Horn <jann@...jh.net>
Cc:     Patrick McHardy <kaber@...sh.net>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        "David S. Miller" <davem@...emloft.net>,
        netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
        security@...nel.org
Subject: Re: [PATCH] netfilter: fix namespace handling in nf_log_proc_dostring

On Sun, Sep 18, 2016 at 09:40:55PM +0200, Jann Horn wrote:
> nf_log_proc_dostring() used current's network namespace instead of the one
> corresponding to the sysctl file the write was performed on. Because the
> permission check happens at open time and the nf_log files in namespaces
> are accessible for the namespace owner, this can be abused by an
> unprivileged user to effectively write to the init namespace's nf_log
> sysctls.

Applied, thanks.