CVE-2017-6519
First published: Fri Feb 24 2017(Updated: )
avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unicast queries with source addresses that are not on-link, which allows remote attackers to cause a denial of service (traffic amplification) and may cause information leakage by obtaining potentially sensitive information from the responding device via port-5353 UDP packets. NOTE: this may overlap CVE-2015-2809.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/avahi | <=0.7-4+deb10u1<=0.7-4+deb10u3 | 0.8-5+deb11u2 0.8-10 0.8-13 |
| ubuntu/avahi | <0.7-3.1ubuntu1.2 | 0.7-3.1ubuntu1.2 |
| ubuntu/avahi | <0.7-4ubuntu2.1 | 0.7-4ubuntu2.1 |
| ubuntu/avahi | <0.6.31-4ubuntu1.3 | 0.6.31-4ubuntu1.3 |
| ubuntu/avahi | <0.6.32~ | 0.6.32~ |
| ubuntu/avahi | <0.8 | 0.8 |
| Avahi Utilities | <=0.6.32 | |
| Avahi Utilities | =0.7 | |
| Ubuntu | =12.04 | |
| Ubuntu | =14.04 | |
| Ubuntu | =16.04 | |
| Ubuntu | =18.04 | |
| Ubuntu | =18.10 |
Remedy
Block udp port 5353 at perimeter firewall
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1426712
- https://www.secfu.net/advisories
- https://github.com/lathiat/avahi/issues/203
- https://github.com/lathiat/avahi/issues/203#issuecomment-449536790
- https://usn.ubuntu.com/3876-2/
- https://usn.ubuntu.com/3876-1/
- https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0@%3Cissues.bookkeeper.apache.org%3E
- https://launchpad.net/bugs/cve/CVE-2017-6519
- https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.apache.org%3E
- https://www.kb.cert.org/vuls/id/550620
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1426717
- https://access.redhat.com/security/cve/CVE-2018-1000845
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1661252
- https://github.com/lathiat/avahi/commit/e111def44a7df4624a4aa3f85fe98054bffb6b4f
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1426712#c5
- https://access.redhat.com/errata/RHSA-2020:1176
- https://access.redhat.com/security/cve/cve-2017-6519
- https://security-tracker.debian.org/tracker/CVE-2017-6519
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-6519
- https://ubuntu.com/security/notices/USN-3876-1
- https://ubuntu.com/security/notices/USN-3876-2
- https://nvd.nist.gov/vuln/detail/CVE-2017-6519
- https://ubuntu.com/security/CVE-2017-6519
Frequently Asked Questions
What is the severity of CVE-2017-6519?
CVE-2017-6519 is rated as a denial of service vulnerability that can lead to traffic amplification.
How do I fix CVE-2017-6519?
To fix CVE-2017-6519, upgrade the Avahi package to version 0.8 or later.
Which versions of Avahi are affected by CVE-2017-6519?
Avahi versions up to and including 0.6.32 and 0.7 are affected by CVE-2017-6519.
Can CVE-2017-6519 lead to information leakage?
Yes, CVE-2017-6519 may allow remote attackers to obtain potentially sensitive information.
Is there a workaround for CVE-2017-6519 if I cannot upgrade?
A workaround for CVE-2017-6519 is to restrict access to the Avahi service to only trusted networks.
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