[USN-4617-1] SPICE vdagent vulnerabilities

[Marc Deslauriers]

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Ubuntu Security Notice USN-4617-1
November 04, 2020

spice-vdagent vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in SPICE vdagent.

Software Description:
- spice-vdagent: Spice agent for Linux

Details:

Matthias Gerstner discovered that SPICE vdagent incorrectly handled the
active_xfers hash table. A local attacker could possibly use this issue to
cause SPICE vdagent to consume memory, resulting in a denial of service.
(CVE-2020-25650)

Matthias Gerstner discovered that SPICE vdagent incorrectly handled the
active_xfers hash table. A local attacker could possibly use this issue to
cause SPICE vdagent to consume memory, resulting in a denial of service, or
obtain sensitive file contents. (CVE-2020-25651)

Matthias Gerstner discovered that SPICE vdagent incorrectly handled a large
number of client connections. A local attacker could possibly use this
issue to cause SPICE vdagent to consume resources, resulting in a denial of
service. (CVE-2020-25652)

Matthias Gerstner discovered that SPICE vdagent incorrectly handled client
connections. A local attacker could possibly use this issue to obtain
sensitive information, paste clipboard contents, and transfer files into
the active session. (CVE-2020-25653)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.10:
  spice-vdagent                   0.20.0-1ubuntu0.1

Ubuntu 20.04 LTS:
  spice-vdagent                   0.19.0-2ubuntu0.2

Ubuntu 18.04 LTS:
  spice-vdagent                   0.17.0-1ubuntu2.2

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://usn.ubuntu.com/4617-1
  CVE-2020-25650, CVE-2020-25651, CVE-2020-25652, CVE-2020-25653

Package Information:
  https://launchpad.net/ubuntu/+source/spice-vdagent/0.20.0-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/spice-vdagent/0.19.0-2ubuntu0.2
  https://launchpad.net/ubuntu/+source/spice-vdagent/0.17.0-1ubuntu2.2

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