CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:S/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
AI Score
Confidence
Low
EPSS
Percentile
71.3%
Package : qemu
Version : 1:2.8+dfsg-6+deb9u15
CVE ID : CVE-2021-3527 CVE-2021-3592 CVE-2021-3594 CVE-2021-3595
CVE-2021-3682 CVE-2021-3713
Debian Bug : 988157 989993 989995 989996 991911 992727
Several security vulnerabilities have been found in Qemu, a fast processor
emulator.
CVE-2021-3713
An out-of-bounds write flaw was found in the UAS (USB Attached SCSI) device
emulation of QEMU. The device uses the guest supplied stream number
unchecked, which can lead to out-of-bounds access to the UASDevice->data3
and UASDevice->status3 fields. A malicious guest user could use this flaw
to crash QEMU or potentially achieve code execution with the privileges of
the QEMU process on the host.
CVE-2021-3682
A flaw was found in the USB redirector device emulation of QEMU. It occurs
when dropping packets during a bulk transfer from a SPICE client due to the
packet queue being full. A malicious SPICE client could use this flaw to
make QEMU call free() with faked heap chunk metadata, resulting in a crash
of QEMU or potential code execution with the privileges of the QEMU process
on the host.
CVE-2021-3527
A flaw was found in the USB redirector device (usb-redir) of QEMU. Small
USB packets are combined into a single, large transfer request, to reduce
the overhead and improve performance. The combined size of the bulk
transfer is used to dynamically allocate a variable length array (VLA) on
the stack without proper validation. Since the total size is not bounded, a
malicious guest could use this flaw to influence the array length and cause
the QEMU process to perform an excessive allocation on the stack, resulting
in a denial of service.
CVE-2021-3594
An invalid pointer initialization issue was found in the SLiRP networking
implementation of QEMU. The flaw exists in the udp_input() function and
could occur while processing a udp packet that is smaller than the size of
the 'udphdr' structure. This issue may lead to out-of-bounds read access or
indirect host memory disclosure to the guest. The highest threat from this
vulnerability is to data confidentiality.
CVE-2021-3592
An invalid pointer initialization issue was found in the SLiRP networking
implementation of QEMU. The flaw exists in the bootp_input() function and
could occur while processing a udp packet that is smaller than the size of
the 'bootp_t' structure. A malicious guest could use this flaw to leak 10
bytes of uninitialized heap memory from the host. The highest threat from
this vulnerability is to data confidentiality.
CVE-2021-3595
An invalid pointer initialization issue was found in the SLiRP networking
implementation of QEMU. The flaw exists in the tftp_input() function and
could occur while processing a udp packet that is smaller than the size of
the 'tftp_t' structure. This issue may lead to out-of-bounds read access or
indirect host memory disclosure to the guest. The highest threat from this
vulnerability is to data confidentiality.
For Debian 9 stretch, these problems have been fixed in version
1:2.8+dfsg-6+deb9u15.
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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OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Debian | 10 | arm64 | qemu-user-static | < 1:3.1+dfsg-8+deb10u10 | qemu-user-static_1:3.1+dfsg-8+deb10u10_arm64.deb |
Debian | 11 | amd64 | libslirp0-dbgsym | < 4.4.0-1+deb11u2 | libslirp0-dbgsym_4.4.0-1+deb11u2_amd64.deb |
Debian | 11 | mipsel | libslirp-dev | < 4.4.0-1+deb11u2 | libslirp-dev_4.4.0-1+deb11u2_mipsel.deb |
Debian | 9 | amd64 | qemu-system-common | < 1:2.8+dfsg-6+deb9u15 | qemu-system-common_1:2.8+dfsg-6+deb9u15_amd64.deb |
Debian | 9 | i386 | qemu-system-mips | < 1:2.8+dfsg-6+deb9u15 | qemu-system-mips_1:2.8+dfsg-6+deb9u15_i386.deb |
Debian | 10 | i386 | qemu-utils | < 1:3.1+dfsg-8+deb10u10 | qemu-utils_1:3.1+dfsg-8+deb10u10_i386.deb |
Debian | 11 | i386 | libslirp0-dbgsym | < 4.4.0-1+deb11u2 | libslirp0-dbgsym_4.4.0-1+deb11u2_i386.deb |
Debian | 9 | armel | qemu-user-static | < 1:2.8+dfsg-6+deb9u15 | qemu-user-static_1:2.8+dfsg-6+deb9u15_armel.deb |
Debian | 10 | arm64 | qemu-system | < 1:3.1+dfsg-8+deb10u10 | qemu-system_1:3.1+dfsg-8+deb10u10_arm64.deb |
Debian | 9 | arm64 | qemu-system-arm | < 1:2.8+dfsg-6+deb9u15 | qemu-system-arm_1:2.8+dfsg-6+deb9u15_arm64.deb |
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:S/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
AI Score
Confidence
Low
EPSS
Percentile
71.3%