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Date: Thu, 17 Sep 2020 00:25:27 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: bugs-syssec@....de
Subject: CVE-2020-25085 QEMU: sdhci: out-of-bounds access issue while doing
multi block SDMA
Hello,
An out-of-bounds r/w access issue was found in the SDHCI Controller emulator
of QEMU. It may occur while doing multi block SDMA, if transfer block size
exceeds the 's->fifo_buffer[s->buf_maxsz]' size. It'd leave the current
element pointer 's->data_count' pointing out of bounds. Leading the subsequent
DMA r/w operation to OOB access issue. A guest user/process may use this flaw
to crash the QEMU process resulting in DoS scenario.
Upstream patches:
-----------------
-> https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg00733.html
-> https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg01439.html
* This issue was reported by Sergej Schumilo, Cornelius Aschermann, Simon
Wrner of Ruhr-University Bochum.
* 'CVE-2020-25085' assigned via https://cveform.mitre.org
Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
8685 545E B54C 486B C6EB 271E E285 8B5A F050 DE8D
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