high
8.5
CWE
763
Advisory Published
CVE Published
Updated

CVE-2021-3682

First published: Tue Aug 03 2021(Updated: )

A flaw was found in the USB redirector device (usb-redir) of QEMU. It occurs when dropping packets during a bulk transfer from a SPICE client due to the packet queue being full. More specifically, the usbredir_buffered_bulk_packet() function calls bufp_alloc() with an invalid pointer that points into the middle of a buffer controlled by the SPICE client. If the packet queue is full, bufp_alloc() ends up freeing the same pointer passed as argument. 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. Upstream issue: <a href="https://gitlab.com/qemu-project/qemu/-/issues/491">https://gitlab.com/qemu-project/qemu/-/issues/491</a> Upstream fix: <a href="https://gitlab.com/qemu-project/qemu/-/commit/5e796671e6b8d5de4b0b423dce1b3eba144a92c9">https://gitlab.com/qemu-project/qemu/-/commit/5e796671e6b8d5de4b0b423dce1b3eba144a92c9</a>

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
QEMU qemu<6.1.0
QEMU qemu=6.1.0-rc1
Redhat Enterprise Linux=8.0
Redhat Enterprise Linux=8.0
Debian Debian Linux=9.0
Debian Debian Linux=10.0
Debian Debian Linux=11.0
debian/qemu<=1:3.1+dfsg-8+deb10u8<=1:5.2+dfsg-11<=1:3.1+dfsg-8
1:6.0+dfsg-3
1:5.2+dfsg-11+deb11u1
redhat/qemu<6.1.0
6.1.0
ubuntu/qemu<1:2.11+dfsg-1ubuntu7.39
1:2.11+dfsg-1ubuntu7.39
ubuntu/qemu<1:4.2-3ubuntu6.21
1:4.2-3ubuntu6.21
ubuntu/qemu<1:6.0+dfsg-2
1:6.0+dfsg-2
ubuntu/qemu<1:6.2+dfsg-2ubuntu5
1:6.2+dfsg-2ubuntu5
ubuntu/qemu<1:6.2+dfsg-2ubuntu5
1:6.2+dfsg-2ubuntu5
ubuntu/qemu<2.0.0+dfsg-2ubuntu1.47+
2.0.0+dfsg-2ubuntu1.47+
ubuntu/qemu<1:2.5+dfsg-5ubuntu10.51+
1:2.5+dfsg-5ubuntu10.51+
debian/qemu<=1:3.1+dfsg-8+deb10u8
1:3.1+dfsg-8+deb10u12
1:5.2+dfsg-11+deb11u3
1:5.2+dfsg-11+deb11u2
1:7.2+dfsg-7+deb12u5
1:8.2.1+ds-2
1:8.2.3+ds-2

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=1989651

Remedy

https://gitlab.com/qemu-project/qemu/-/commit/5e796671e6b8d5de4b0b423dce1b3eba144a92c9

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-3682?

    CVE-2021-3682 is a vulnerability in the USB redirector device emulation of QEMU.

  • How severe is CVE-2021-3682?

    CVE-2021-3682 has a severity score of 8.5, which is considered high.

  • Which software versions are affected by CVE-2021-3682?

    Versions prior to 6.1.0-rc2 of QEMU are affected by CVE-2021-3682.

  • How can I fix CVE-2021-3682?

    To fix CVE-2021-3682, update QEMU to version 6.1.0 or later.

  • Where can I find more information about CVE-2021-3682?

    You can find more information about CVE-2021-3682 at the following references: [Link 1](https://gitlab.com/qemu-project/qemu/-/issues/491), [Link 2](https://gitlab.com/qemu-project/qemu/-/commit/5e796671e6b8d5de4b0b423dce1b3eba144a92c9), [Link 3](https://gitlab.com/qemu-project/qemu/-/commit/b2d1fe67d09d2b6c7da647fbcea6ca0148c206d3).

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