CVE-2021-3700: Use After Free
First published: Wed Aug 11 2021(Updated: )
A use-after-free vulnerability was found in usbredir in versions prior to 0.11.0 in the usbredirparser_serialize() in usbredirparser/usbredirparser.c. This issue occurs when serializing large amounts of buffered write data in the case of a slow or blocked destination.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/usbredir | <0.11.0 | 0.11.0 |
| Spice-space Usbredir | <0.11.0 | |
| Redhat Enterprise Linux | =6.0 | |
| Redhat Enterprise Linux | =7.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Fedoraproject Fedora | =34 | |
| Debian Debian Linux | =9.0 |
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Reference Links
- https://gitlab.freedesktop.org/spice/usbredir/-/commit/03c519ff5831ba
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1992832
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1992831
- https://bugzilla.redhat.com/show_bug.cgi?id=1992830
- https://lists.debian.org/debian-lts-announce/2022/03/msg00030.html
Frequently Asked Questions
What is CVE-2021-3700?
CVE-2021-3700 is a use-after-free vulnerability found in usbredir in versions prior to 0.11.0 in the usbredirparser_serialize() in usbredirparser/usbredirparser.c.
How does CVE-2021-3700 occur?
This vulnerability occurs when serializing large amounts of buffered write data in the case of a slow or blocked destination.
Which software versions are affected by CVE-2021-3700?
Versions prior to 0.11.0 of usbredir, Spice-space Usbredir, Redhat Enterprise Linux 6.0, Redhat Enterprise Linux 7.0, Redhat Enterprise Linux 8.0, Fedoraproject Fedora 34, and Debian Debian Linux 9.0 are affected by CVE-2021-3700.
What is the severity of CVE-2021-3700?
The severity of CVE-2021-3700 is medium, with a CVSS score of 6.4.
How can CVE-2021-3700 be fixed?
To fix CVE-2021-3700, update usbredir to version 0.11.0 or later.
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