oss-security - CVE request -- Linux kernel: net: ping: refcount issue in ping_init

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Message-ID: <20140411115633.GA325@dhcp-25-225.brq.redhat.com>
Date: Fri, 11 Apr 2014 13:56:34 +0200
From: Petr Matousek <pmatouse@...hat.com>
To: oss-security@...ts.openwall.com
Cc: Mateusz Guzik <mguzik@...hat.com>
Subject: CVE request -- Linux kernel: net: ping: refcount issue in
 ping_init_sock() function

A flaw was found in the way ping_init_sock() function handled group_info
struct reference counter. Since group_info refcounter is only
incremented but never decremented in this codepath, it could lead to
refcounter overflow and possibly to use-after-free issue later.

An unprivileged local user could use this flaw to crash the system or,
potentially, escalate their privileges on the system.

Upstream patch proposal:
https://lkml.org/lkml/2014/4/10/736

References:
https://bugzilla.redhat.com/show_bug.cgi?id=1086730

Thanks,
-- 
Petr Matousek / Red Hat Security Response Team
PGP: 0xC44977CA 8107 AF16 A416 F9AF 18F3  D874 3E78 6F42 C449 77CA

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