CVE-2021-3502: Null Pointer Dereference
First published: Sat Mar 27 2021(Updated: )
A flaw was found in avahi 0.8-5. A reachable assertion is present in avahi_s_host_name_resolver_start function allowing a local attacker to crash the avahi service by requesting hostname resolutions through the avahi socket or dbus methods for invalid hostnames. The highest threat from this vulnerability is to the service availability.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Avahi Avahi | =0.8-5 | |
| debian/avahi | 0.8-5+deb11u2 0.8-10 0.8-13 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1946914
- https://github.com/lathiat/avahi/issues/338
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=986018
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1946916
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1946914#c3
- https://github.com/lathiat/avahi/commit/80c98fa16782e921f5b5d5c880f1d80f5c43bd49
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1946914#c12
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1989381
- https://access.redhat.com/errata/RHSA-2023:6707
- https://security-tracker.debian.org/tracker/CVE-2021-3502
- https://salsa.debian.org/utopia-team/avahi/-/commit/81475380441f9d42b9db3f718372d249d1f3686b
- https://bugs.debian.org/986018
- https://github.com/avahi/avahi/issues/338
- https://github.com/avahi/avahi/commit/9d31939e55280a733d930b15ac9e4dda4497680c
- https://github.com/avahi/avahi/commit/80c98fa16782e921f5b5d5c880f1d80f5c43bd49
Frequently Asked Questions
What is the CVE ID of this vulnerability?
The CVE ID of this vulnerability is CVE-2021-3502.
What is the severity of CVE-2021-3502?
The severity of CVE-2021-3502 is medium, with a CVSSv3 score of 5.5.
Which software version is affected by CVE-2021-3502?
The Avahi software version 0.8-5 is affected by CVE-2021-3502.
How can a local attacker exploit this vulnerability?
A local attacker can crash the Avahi service by requesting hostname resolutions through the avahi socket or dbus methods with invalid hostnames.
Are there any references for further information about CVE-2021-3502?
Yes, you can find more information about CVE-2021-3502 in the following references: 1. [Red Hat Bugzilla](https://bugzilla.redhat.com/show_bug.cgi?id=1946914) 2. [Avahi GitHub Issue](https://github.com/lathiat/avahi/issues/338)
- collector/nvd-index
- agent/type
- agent/first-publish-date
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2021-3502
- collector/debian-bugs
- source/Debian
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- collector/mitre-cve
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- agent/last-modified-date
- agent/tags
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- canonical/avahi avahi
- version/avahi avahi/0.8-5
- package-manager/debian