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[Bug 1909247] Re: QEMU: use after free vulnerability in esp_do_dma() in
[Bug 1909247] Re: QEMU: use after free vulnerability in esp_do_dma() in hw/scsi/esp.c
Fri, 15 Jan 2021 16:16:48 -0000
** Tags added: fuzzer
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QEMU: use after free vulnerability in esp_do_dma() in hw/scsi/esp.c
Status in QEMU:
A use-after-free vulnerability was found in the am53c974 SCSI host bus
adapter emulation of QEMU. It could occur in the esp_do_dma() function
in hw/scsi/esp.c while handling the 'Information Transfer' command
(CMD_TI). A privileged guest user may abuse this flaw to crash the
QEMU process on the host, resulting in a denial of service or
potential code execution with the privileges of the QEMU process.
This issue was reported by Cheolwoo Myung (Seoul National University).
Using hypervisor fuzzer, hyfuzz, I found a use-after-free issue in
am53c974 emulator of QEMU enabled ASan.
It occurs while transferring information, as it does not check the
buffer to be transferred.
A malicious guest user/process could use this flaw to crash the QEMU
process resulting in DoS scenario.
To reproduce this issue, please run the QEMU with the following command
# To enable ASan option, please set configuration with the following
$ ./configure --target-list=i386-softmmu --disable-werror --enable-sanitizers
# To reproduce this issue, please run the QEMU process with the following
$ ./qemu-system-i386 -m 512 -drive
-device am53c974,id=scsi -device scsi-hd,drive=SysDisk \
Please find attached the disk images to reproduce this issue.
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Peter Maydell <=