CVE-2017-6519
published 2017-05-01CVE-2017-6519: 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…
PriorityP344critical9.1CVSS 3.1
AVNACLPRNUINSUCHINAH
EPSS
3.08%
86.2th percentile
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.
Affected
18 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| avahi | avahi | <= 0.6.32 | — |
| avahi | avahi | — | — |
| avahi | avahi | >= 0 < 0.7-5 | 0.7-5 |
| avahi | avahi | >= 0 < 0.7-5 | 0.7-5 |
| avahi | avahi | >= 0 < 0.7-5 | 0.7-5 |
| avahi | avahi | >= 0 < 0.7-5 | 0.7-5 |
| avahi | avahi | >= 0 < 0.6.31-4ubuntu1.3 | 0.6.31-4ubuntu1.3 |
| avahi | avahi | >= 0 < 0.6.32~rc+dfsg-1ubuntu2.3 | 0.6.32~rc+dfsg-1ubuntu2.3 |
| avahi | avahi | >= 0 < 0.7-3.1ubuntu1.2 | 0.7-3.1ubuntu1.2 |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| debian | avahi | < avahi 0.7-5 (bookworm) | avahi 0.7-5 (bookworm) |
| msrc | cbl2_avahi_0.8-1_on_cbl_mariner_2.0 | — | — |
| msrc | cbl_mariner_2.0_arm | — | — |
| msrc | cbl_mariner_2.0_x64 | — | — |
CVSS provenance
nvdv3.19.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
nvdv3.09.1CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
nvdv2.06.4MEDIUMAV:N/AC:L/Au:N/C:P/I:N/A:P
osv9.1CRITICAL
vendor_msrc9.1CRITICAL
vendor_redhat9.1CRITICAL
vendor_ubuntu9.1CRITICAL
vendor_debian5.0LOW
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Ubuntu
Avahi vulnerabilities
vendor_ubuntu·2019-01-31·CVSS 9.1
CVE-2017-6519 [CRITICAL] Avahi vulnerabilities
Title: Avahi vulnerabilities
Summary: Several security issues were fixed in Avahi.
Chad Seaman discovered that Avahi incorrectly handled certain messages.
An attacker could possibly use this issue to cause a denial of service.
(CVE-2017-6519, CVE-2018-1000845)
Instructions: In general, a standard system update will make all the necessary changes.
Ubuntu
Avahi vulnerabilities
vendor_ubuntu·2019-01-31·CVSS 9.1
CVE-2017-6519 [CRITICAL] Avahi vulnerabilities
Title: Avahi vulnerabilities
Summary: Several security issues were fixed in Avahi.
USN-3876-1 fixed a vulnerability in Avahi. This update provides
the corresponding update for Ubuntu 12.04 ESM.
Original advisory details:
Chad Seaman discovered that Avahi incorrectly handled certain messages.
An attacker could possibly use this issue to cause a denial of service.
(CVE-2017-6519, CVE-2018-1000845)
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
avahi: DNS amplification and reflection to spoofed addresses
vendor_redhat·2018-11-08·CVSS 9.1
CVE-2018-1000845 [CRITICAL] CWE-406 avahi: DNS amplification and reflection to spoofed addresses
avahi: DNS amplification and reflection to spoofed addresses
No description is available for this CVE.
Statement: This flaw was found to be a duplicate of CVE-2017-6519. Please see https://access.redhat.com/security/cve/CVE-2017-6519 for information about affected products and security errata.
Mitigation: Ensure UDP port 5353 is blocked in the firewall. Moreover, configure correctly the rate limiting options based on your needs (see ratelimit-interval-usec and ratelimit-burst options in /etc/avahi/avahi-daemon.conf).
Package: avahi (Red Hat Enterprise Linux 5) - Not affected
Package: avahi (Red Hat Enterprise Linux 6) - Not affected
Package: avahi (Red Hat Enterprise Linux 7) - Not affected
Package: avahi (Red Hat Enterprise Linux 8) - Not affected
Package: redhat-virtualization-ho
Microsoft
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 (traff
vendor_msrc·2017-05-09·CVSS 9.1
CVE-2017-6519 [MEDIUM] CWE-346 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 (traff
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.
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to tr
Debian
CVE-2017-6519: avahi - avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unic...
vendor_debian·2017·CVSS 5.0
CVE-2017-6519 [MEDIUM] CVE-2017-6519: avahi - avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unic...
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.
Scope: local
bookworm: resolved (fixed in 0.7-5)
bullseye: resolved (fixed in 0.7-5)
forky: resolved (fixed in 0.7-5)
sid: resolved (fixed in 0.7-5)
trixie: resolved (fixed in 0.7-5)
Red Hat
avahi: Multicast DNS responds to unicast queries outside of local network
vendor_redhat·2015-03-31·CVSS 5.0
CVE-2017-6519 [MEDIUM] CWE-200 avahi: Multicast DNS responds to unicast queries outside of local network
avahi: Multicast DNS responds to unicast queries outside of local network
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.
A vulnerability was found in Avahi, where the avahi-daemon improperly handles responses to IPv6 unicast queries, a remote attacker could exploit this flaw by sending specially crafted port-5353 UDP packets, potentially causing a denial of service (traffic amplification) or leaking sensitive information.
Statement: This vulnerabil
GHSA
GHSA-6vpj-pr2c-5mm2: avahi-daemon in Avahi through 0
ghsa_unreviewed·2022-05-13·CVSS 5.0
CVE-2017-6519 [MEDIUM] CWE-346 GHSA-6vpj-pr2c-5mm2: avahi-daemon in Avahi through 0
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.
OSV
avahi vulnerabilities
osv·2019-01-31·CVSS 9.1
CVE-2017-6519 [CRITICAL] avahi vulnerabilities
avahi vulnerabilities
Chad Seaman discovered that Avahi incorrectly handled certain messages.
An attacker could possibly use this issue to cause a denial of service.
(CVE-2017-6519, CVE-2018-1000845)
OSV
CVE-2017-6519: avahi-daemon in Avahi through 0
osv·2017-05-01·CVSS 5.0
CVE-2017-6519 [MEDIUM] CVE-2017-6519: avahi-daemon in Avahi through 0
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.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2018-1000845 avahi: DNS amplification and reflection to spoofed addresses [fedora-all]
bugzilla·2018-12-20·CVSS 9.1
CVE-2018-1000845 [CRITICAL] CVE-2018-1000845 avahi: DNS amplification and reflection to spoofed addresses [fedora-all]
CVE-2018-1000845 avahi: DNS amplification and reflection to spoofed addresses [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects multiple suppo
Bugzilla
CVE-2018-1000845 avahi: DNS amplification and reflection to spoofed addresses
bugzilla·2018-12-20·CVSS 9.1
CVE-2018-1000845 [CRITICAL] CVE-2018-1000845 avahi: DNS amplification and reflection to spoofed addresses
CVE-2018-1000845 avahi: DNS amplification and reflection to spoofed addresses
Avahi-daemon in Avahi through 0.7 inadvertently sends Legacy Unicast
Responses to IPv4 unicast queries with source addresses that are not
link-local, which allows remote attackers to cause a denial of service
(traffic amplification) or obtain potentially sensitive information
via port-5353 UDP packets.
send(IP(src="1.1.1.1",dst="192.168.1.1")/UDP(sport=53,
dport=5353)/DNS(rd=1,qd=DNSQR(qtype="PTR", qname="_ssh._tcp.local.")))
Upstream issue:
https://github.com/lathiat/avahi/issues/203
Discussion:
Created avahi tracking bugs for this issue:
Affects: fedora-all [bug 1661253]
---
This looks to be CVE-2018-1000845.
---
I have pushed a fix upstream for the issue here:
https://github.com/lathiat/avahi/commit
Bugzilla
CVE-2017-6519 avahi: Multicast DNS responds to unicast queries outside of local network [fedora-all]
bugzilla·2017-02-24·CVSS 9.1
CVE-2017-6519 [CRITICAL] CVE-2017-6519 avahi: Multicast DNS responds to unicast queries outside of local network [fedora-all]
CVE-2017-6519 avahi: Multicast DNS responds to unicast queries outside of local network [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects mult
Bugzilla
CVE-2017-6519 avahi: Multicast DNS responds to unicast queries outside of local network
bugzilla·2017-02-24·CVSS 9.1
CVE-2017-6519 [CRITICAL] CVE-2017-6519 avahi: Multicast DNS responds to unicast queries outside of local network
CVE-2017-6519 avahi: Multicast DNS responds to unicast queries outside of local network
It was found that avahi responds to unicast queries coming from outside of local network which may cause an information leak, such as disclosing the device type/model that responds to the request or the operating system. The mDNS response may also be used to amplify denial of service attacks against other networks as the response size is greater than the size of request.
External References:
https://www.kb.cert.org/vuls/id/550620
Discussion:
Created avahi tracking bugs for this issue:
Affects: fedora-all [bug 1426717]
---
While all versions of avahi seem to be affected, for reasons discussed at the CERT link above this is not strictly a security bug.
> While this technically follows established
https://bugzilla.redhat.com/show_bug.cgi?id=1426712https://github.com/lathiat/avahi/issues/203https://github.com/lathiat/avahi/issues/203#issuecomment-449536790https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.apache.org%3Ehttps://usn.ubuntu.com/3876-1/https://usn.ubuntu.com/3876-2/https://www.secfu.net/advisorieshttps://bugzilla.redhat.com/show_bug.cgi?id=1426712https://github.com/lathiat/avahi/issues/203https://github.com/lathiat/avahi/issues/203#issuecomment-449536790https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.apache.org%3Ehttps://usn.ubuntu.com/3876-1/https://usn.ubuntu.com/3876-2/https://www.secfu.net/advisories
2017-05-01
Published