xfrm_user: validate XFRM_MSG_NEWAE ... CVE-2017-7184

Tracked by Jolla (In release)

asked 2017-05-03 12:24:13 +0300

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updated 2017-05-03 12:26:15 +0300

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The xfrm_replay_verify_len function in net/xfrm/xfrm_user.c in the Linux kernel through 4.10.6 does not validate certain size data after an XFRM_MSG_NEWAE update, which allows local users to obtain root privileges or cause a denial of service (heap-based out-of-bounds access) by leveraging the CAP_NET_ADMIN capability, as demonstrated during a Pwn2Own competition at CanSecWest 2017 for the Ubuntu 16.10 linux-image-* package

This is confirmed in link and link

Only vulnerable if unprivileged user namespaces are enabled.

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