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AUSCERT External Security Bulletin Redistribution
ESB-2021.0614
qemu security update
19 February 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: qemu
Publisher: Debian
Operating System: Debian GNU/Linux
Impact/Access: Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-20221 CVE-2021-20181 CVE-2020-29443
CVE-2020-29130 CVE-2020-28916 CVE-2020-25084
CVE-2020-15859 CVE-2020-15469 CVE-2020-2891
Reference: ESB-2021.0589
ESB-2021.0552
ESB-2021.0430
Original Bulletin:
https://lists.debian.org/debian-lts-announce/2021/02/msg00024.html
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Debian LTS Advisory DLA-2560-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Sylvain Beucler
February 18, 2021 https://wiki.debian.org/LTS
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Package : qemu
Version : 1:2.8+dfsg-6+deb9u13
CVE ID : CVE-2020-15469 CVE-2020-15859 CVE-2020-25084 CVE-2020-2891=
6=20
CVE-2020-29130 CVE-2020-29443 CVE-2021-20181 CVE-2021-20221
Debian Bug : 970253 965978 970539 974687 976388
Several vulnerabilities were discovered in QEMU, a fast processor
emulator (notably used in KVM and Xen HVM virtualization). An attacker
could trigger a denial-of-service (DoS), information leak, and
possibly execute arbitrary code with the privileges of the QEMU
process on the host.
CVE-2020-15469
A MemoryRegionOps object may lack read/write callback methods,
leading to a NULL pointer dereference.
CVE-2020-15859
QEMU has a use-after-free in hw/net/e1000e_core.c because a guest
OS user can trigger an e1000e packet with the data's address set
to the e1000e's MMIO address.
CVE-2020-25084
QEMU has a use-after-free in hw/usb/hcd-xhci.c because the
usb_packet_map return value is not checked.
CVE-2020-28916
hw/net/e1000e_core.c has an infinite loop via an RX descriptor
with a NULL buffer address.
CVE-2020-29130
slirp.c has a buffer over-read because it tries to read a certain
amount of header data even if that exceeds the total packet
length.
CVE-2020-29443
ide_atapi_cmd_reply_end in hw/ide/atapi.c allows out-of-bounds
read access because a buffer index is not validated.
CVE-2021-20181
9pfs: ZDI-CAN-10904: QEMU Plan 9 file system TOCTOU privilege
escalation vulnerability.
CVE-2021-20221
aarch64: GIC: out-of-bound heap buffer access via an interrupt ID
field.
For Debian 9 stretch, these problems have been fixed in version
1:2.8+dfsg-6+deb9u13.
We recommend that you upgrade your qemu packages.
For the detailed security status of qemu please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/qemu
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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