Local Denial of Service Vulnerability in Debian Avahi Package
CVE-2021-26720

7.8HIGH

Key Information:

Vendor

Avahi

Status
Avahi
Vendor
CVE Published:
17 February 2021

What is CVE-2021-26720?

The avahi-daemon-check-dns.sh script within the Debian avahi package executes with root privileges via the /etc/network/if-up.d/avahi-daemon script. This flaw allows a local attacker to mount a symlink attack, potentially leading to denial of service by creating arbitrary empty files in the /run/avahi-daemon directory. This vulnerability impacts only the packaging for Debian GNU/Linux and indirectly affects SUSE, and does not pertain to the upstream Avahi product.

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References

https://packages.debian.org/buster/avahi-daemon
x_refsource_MISC
https://packages.debian.org/sid/avahi-daemon
x_refsource_MISC
https://packages.debian.org/bullseye/avahi-daemon
x_refsource_MISC

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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