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 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://security-tracker.debian.org/tracker/CVE-2021-3502
- https://bugzilla.redhat.com/show_bug.cgi?id=1946914
- https://salsa.debian.org/utopia-team/avahi/-/commit/81475380441f9d42b9db3f718372d249d1f3686b
- https://bugs.debian.org/986018
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=986018
- https://github.com/lathiat/avahi/issues/338
- 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://github.com/lathiat/avahi/commit/9d31939e55280a733d930b15ac9e4dda4497680c
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/last-modified-date
- agent/first-publish-date
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2021-3502
- collector/debian-bugs
- source/Debian
- agent/references
- agent/remedy
- agent/severity
- agent/weakness
- agent/author
- agent/tags
- agent/event
- collector/security-tracker-debian
- agent/software-canonical-lookup
- agent/description
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- vendor/avahi
- canonical/avahi avahi
- version/avahi avahi/0.8-5
- package-manager/debian