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Date: Tue, 9 Jun 2020 10:58:08 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Eric Blake <eblake@...hat.com>, Xueqiang Wei <xuwei@...hat.com>
Subject: CVE-2020-10761 QEMU: nbd: reachable assertion failure
innbd_negotiate_send_rep_verr via remote client
Hello,
Quick Emulator(Qemu) built with the Network Block Device(NBD) Server support
is vulnerable to a crash via assertion failure. It could occur when a
nbd-client sends a spec-compliant request that is near the boundary of the
maximum permitted length. A remote user/process could use this flaw to crash
the qemu-nbd server resulting in DoS.
Upstream patch:
---------------
-> https://lists.gnu.org/archive/html/qemu-devel/2020-06/msg02031.html
Issue introduced since QEMU v4.2
-> https://git.qemu.org/?p=qemu.git;a=commit;h=93676c88d7a5cd5971de94f9091eff8e9773b1af
server:
- Adjust things to allow full 4k name limit rather than previous 256 byte
limit
- It allowed nbd-client to send longer (>256 bytes) export names
This issue was reported by Eric Blake and Xueqiang Wei of Red Hat Inc.
Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
8685 545E B54C 486B C6EB 271E E285 8B5A F050 DE8D
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