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CVE-2021-3593: invalid pointer initialization may lead to information disclosure (udp6)

An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp6_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.

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Bug 1970487 (CVE-2021-3593) - CVE-2021-3593 QEMU: slirp: invalid pointer initialization may lead to information disclosure (udp6)

Summary: CVE-2021-3593 QEMU: slirp: invalid pointer initialization may lead to informa…

Keywords:

Status:

CLOSED ERRATA

Alias:

CVE-2021-3593

Product:

Security Response

Classification:

Other

Component:

vulnerability

Sub Component:

Version:

unspecified

Hardware:

All

OS:

Linux

Priority:

low

Severity:

low

Target Milestone:

Assignee:

Red Hat Product Security

QA Contact:

Docs Contact:

URL:

Whiteboard:

Depends On:

1970834 1970835 1970836 1970837 1970838 1970839 1970840 1970842 1972245 1972247 1972250

Blocks:

1969478 1970557

TreeView+

depends on / blocked

Reported:

2021-06-10 14:51 UTC by Mauro Matteo Cascella

Modified:

2022-04-17 21:27 UTC (History)

CC List:

27 users (show)

Fixed In Version:

libslirp 4.6.0

Doc Type:

If docs needed, set a value

Doc Text:

An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp6_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.

Clone Of:

Environment:

Last Closed:

2021-11-09 22:55:03 UTC

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Priority

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Summary

Last Updated

Red Hat Product Errata

RHSA-2021:4191

0

None

None

None

2021-11-09 17:40:00 UTC

Description Mauro Matteo Cascella 2021-06-10 14:51:49 UTC

An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The function udp6_input() handles requests for the udp protocol from the guest. While processing a udp packet that is smaller than the size of the udphdr structure it uses memory from outside the working mbuf buffer. This issue may lead to out of bound read access or indirect memory disclosure to the guest.

Upstream commits: https://gitlab.freedesktop.org/slirp/libslirp/-/commit/93e645e7 https://gitlab.freedesktop.org/slirp/libslirp/-/commit/de71c15d

Comment 5 Mauro Matteo Cascella 2021-06-15 13:51:20 UTC

Created libslirp tracking bugs for this issue:

Affects: epel-all [bug 1972247] Affects: fedora-all [bug 1972250]

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1972245]

Comment 6 errata-xmlrpc 2021-11-09 17:39:57 UTC

This issue has been addressed in the following products:

Red Hat Enterprise Linux 8

Via RHSA-2021:4191 https://access.redhat.com/errata/RHSA-2021:4191

Comment 7 Product Security DevOps Team 2021-11-09 22:54:59 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-3593

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Related news

RHSA-2021:4191: Red Hat Security Advisory: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update

An update for the virt:rhel and virt-devel:rhel modules is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original. Related CVEs: * CVE-2020-15859: QEMU: net: e1000e: use-after-free while sending packets * CVE-2021-3592: QEMU: slirp: invalid pointer initialization may lead to information disclosure (bootp) * CVE-2021-3593: QEMU: slirp: invalid pointer initialization may lead to information disclosure (udp6) * CVE-2021-3594: QEMU: slirp: invalid pointer initi...

CVE-2021-3593: Invalid Bug ID

An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp6_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.

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