CVE-2023-1981

A vulnerability was found in the avahi library. This flaw allows an unprivileged user to make a dbus call, causing the avahi daemon to crash.

A vulnerability was found in the avahi library. This flaw allows an unprivileged user to make a dbus call, causing the avahi daemon to crash.

A vulnerability was found in the avahi library. This flaw allows an unprivileged user to make a dbus call, causing the avahi daemon to crash.

Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. This enables you to plug your laptop or computer into a network and instantly be able to view other people who you can chat with, find printers to print to or find files being shared.

Security Fix(es):

It was discovered that the avahi deamon can be locally crashed by a dbus call made by an unprivileged user, causing a denial of service.

References:

https://github.com/lathiat/avahi/issues/375(CVE-2023-1981)

A vulnerability was found in the avahi library. This flaw allows an unprivileged user to make a dbus call, causing the avahi daemon to crash.

Avahi is an implementation of the DNS Service Discovery and Multicast DNS specifications for Zero Configuration Networking. It facilitates service discovery on a local network. Avahi and Avahi-aware applications allow you to plug your computer into a network and, with no configuration, view other people to chat with, view printers to print with, and find shared files on other computers.

Security Fix(es):

• avahi: Local DoS by event-busy-loop from writing long lines to /run/avahi-daemon/socket (CVE-2021-3468)
• avahi: reachable assertion in avahi_s_host_name_resolver_start when trying to resolve badly-formatted hostnames (CVE-2021-3502)
• avahi: avahi-daemon can be crashed via DBus (CVE-2023-1981)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

Avahi is an implementation of the DNS Service Discovery and Multicast DNS specifications for Zero Configuration Networking. It facilitates service discovery on a local network. Avahi and Avahi-aware applications allow you to plug your computer into a network and, with no configuration, view other people to chat with, view printers to print with, and find shared files on other computers.

Security Fix(es):

• avahi: avahi-daemon can be crashed via DBus (CVE-2023-1981)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

• CVE-2021-3468: handle termination event on avahi Unix socket to prevent infinite loop
• CVE-2023-1981: prevent avahi daemon crash by emitting an error if the requested D-Bus service is not found
• CVE-2021-3502: fix avahi-daemon crashing from NULL pointer assertions
• CVE-2023-38469: reject overly long TXT resource records to prevent reachable assertion in avahi_dns_packet_append_record
• CVE-2023-38470: ensure each label is at least one byte long in avahi_normalize_name() to prevent reachable assertion in avahi_escape_label()
• CVE-2023-38471: fix creating invalid escape sequence in dbus_set_host_name function
• CVE-2023-38472: ensure avahi_rdata_parse() has valid rdata before parsing to prevent reachable assertion
• CVE-2023-38473: normalize input in avahi_alternative_host_name() to prevent reachable assertion due to unescaped dot handling

Fixes crash on some invalid DBus calls. (CVE-2023-1981)

These are all security issues fixed in the avahi-0.8-23.1 package on the GA media of openSUSE Tumbleweed.

Avahi is an implementation of the DNS Service Discovery and Multicast DNS specifications for Zero Configuration Networking. It facilitates service discovery on a local network. Avahi and Avahi-aware applications allow you to plug your computer into a network and, with no configuration, view other people to chat with, view printers to print with, and find shared files on other computers.

Security Fix(es):

• avahi: avahi-daemon can be crashed via DBus (CVE-2023-1981)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Rocky Linux 8.9 Release Notes linked from the References section.

This update for avahi fixes the following issues:

• CVE-2023-1981: Fixed crash in avahi-daemon (bsc#1210328).

This update for avahi fixes the following issues:

• CVE-2023-1981: Fixed crash in avahi-daemon (bsc#1210328).

This update for avahi fixes the following issues:

• CVE-2023-1981: Fixed crash in avahi-daemon (bsc#1210328).

It was discovered that Avahi incorrectly handled certain DBus messages. A local attacker could possibly use this issue to cause Avahi to crash, resulting in a denial of service.

USN-6129-1 fixed a vulnerability in Avahi. This update provides the corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.

Original advisory details:

It was discovered that Avahi incorrectly handled certain DBus messages. A local attacker could possibly use this issue to cause Avahi to crash, resulting in a denial of service.