--------------------------------------------------------------------------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
--------------------------------------------------------------------------Package        : qemu
Version        : 1:2.8+dfsg-6+deb9u13
CVE ID         : CVE-2020-15469 CVE-2020-15859 CVE-2020-25084 CVE-2020-28916 
                 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/source-package/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