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authorAndy Whitcroft <apw@canonical.com>2017-03-22 07:29:31 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2017-03-29 08:40:06 -0700
commit677e806da4d916052585301785d847c3b3e6186a (patch)
tree094a72733ec4b13d8a85f11eb1f32e1b1888fdf3 /net/xfrm
parentc470abd4fde40ea6a0846a2beab642a578c0b8cd (diff)
downloadop-kernel-dev-677e806da4d916052585301785d847c3b3e6186a.zip
op-kernel-dev-677e806da4d916052585301785d847c3b3e6186a.tar.gz
xfrm_user: validate XFRM_MSG_NEWAE XFRMA_REPLAY_ESN_VAL replay_window
When a new xfrm state is created during an XFRM_MSG_NEWSA call we validate the user supplied replay_esn to ensure that the size is valid and to ensure that the replay_window size is within the allocated buffer. However later it is possible to update this replay_esn via a XFRM_MSG_NEWAE call. There we again validate the size of the supplied buffer matches the existing state and if so inject the contents. We do not at this point check that the replay_window is within the allocated memory. This leads to out-of-bounds reads and writes triggered by netlink packets. This leads to memory corruption and the potential for priviledge escalation. We already attempt to validate the incoming replay information in xfrm_new_ae() via xfrm_replay_verify_len(). This confirms that the user is not trying to change the size of the replay state buffer which includes the replay_esn. It however does not check the replay_window remains within that buffer. Add validation of the contained replay_window. CVE-2017-7184 Signed-off-by: Andy Whitcroft <apw@canonical.com> Acked-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'net/xfrm')
-rw-r--r--net/xfrm/xfrm_user.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 9705c27..cdf887f 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -415,6 +415,9 @@ static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_es
if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
return -EINVAL;
+ if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
+ return -EINVAL;
+
return 0;
}
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