CVE-2021-3594
First published: Thu Jun 10 2021(Updated: )
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. This flaw affects libslirp versions prior to 4.6.0.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/libslirp | <4.6.0 | 4.6.0 |
| debian/libslirp | 4.4.0-1+deb11u2 4.7.0-1 4.8.0-1 | |
| debian/qemu | 1:5.2+dfsg-11+deb11u3 1:5.2+dfsg-11+deb11u2 1:7.2+dfsg-7+deb12u12 1:9.2.0+ds-5 1:9.2.1+ds-1 | |
| libslirp | <4.6.0 | |
| Red Hat Enterprise Linux | =8.0 | |
| Red Hat Enterprise Linux | =8.0 | |
| Debian | =9.0 | |
| Fedora | =33 | |
| Fedora | =34 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1970491
- https://lists.debian.org/debian-lts-announce/2021/09/msg00000.html
- https://lists.debian.org/debian-lts-announce/2023/03/msg00013.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCKWZWY64EHTOQMLVLTSZ4AA27EWRJMH/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SGPQZFVJCFGDSISFXPCQTTBBD7QZLJKI/
- https://security.gentoo.org/glsa/202107-44
- https://security.netapp.com/advisory/ntap-20210805-0004/
- https://launchpad.net/bugs/cve/CVE-2021-3594
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GCKWZWY64EHTOQMLVLTSZ4AA27EWRJMH/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SGPQZFVJCFGDSISFXPCQTTBBD7QZLJKI/
- https://gitlab.freedesktop.org/slirp/libslirp/-/commit/93e645e7
- https://gitlab.freedesktop.org/slirp/libslirp/-/commit/74572be4
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1972251
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1972252
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1972248
- https://access.redhat.com/errata/RHSA-2021:4191
- https://access.redhat.com/security/cve/cve-2021-3594
- https://gitlab.freedesktop.org/slirp/libslirp/-/commit/93e645e72a056ec0b2c16e0299fc5c6b94e4ca17
- https://gitlab.freedesktop.org/slirp/libslirp/-/commit/74572be49247c8c5feae7c6e0b50c4f569ca9824
- https://security-tracker.debian.org/tracker/CVE-2021-3594
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3594
- https://nvd.nist.gov/vuln/detail/CVE-2021-3594
- https://ubuntu.com/security/CVE-2021-3594
Frequently Asked Questions
What is CVE-2021-3594?
CVE-2021-3594 is an invalid pointer initialization issue found in the SLiRP networking implementation of QEMU.
What is the severity of CVE-2021-3594?
The severity of CVE-2021-3594 is low (CVSS score of 3.8).
How does the vulnerability in CVE-2021-3594 occur?
The vulnerability in CVE-2021-3594 occurs in the udp_input() function of the SLiRP networking implementation in QEMU while processing a udp packet that is smaller than the size of the 'udphdr' structure.
What are the possible impacts of CVE-2021-3594?
CVE-2021-3594 may lead to out-of-bounds read access or potential code execution.
How can I mitigate CVE-2021-3594?
To mitigate CVE-2021-3594, it is recommended to update the affected software to version 4.6.0 or apply the appropriate security patches provided by the vendor.
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