From: Ankur Tyagi <[email protected]> Backport the patch[1] from the PR[2] mentioned in the nvd[3].
[1] https://github.com/avahi/avahi/commit/2d48e42d44a183f26a4d12d1f5d41abb9b7c6355 [2] https://github.com/avahi/avahi/pull/806 [3] https://nvd.nist.gov/vuln/detail/CVE-2025-68276 Dropped CI changes from the original PR during backport. Signed-off-by: Ankur Tyagi <[email protected]> --- meta/recipes-connectivity/avahi/avahi_0.8.bb | 1 + .../avahi/files/CVE-2025-68276.patch | 65 +++++++++++++++++++ 2 files changed, 66 insertions(+) create mode 100644 meta/recipes-connectivity/avahi/files/CVE-2025-68276.patch diff --git a/meta/recipes-connectivity/avahi/avahi_0.8.bb b/meta/recipes-connectivity/avahi/avahi_0.8.bb index 7930bd3037..bb20fd17cc 100644 --- a/meta/recipes-connectivity/avahi/avahi_0.8.bb +++ b/meta/recipes-connectivity/avahi/avahi_0.8.bb @@ -37,6 +37,7 @@ SRC_URI = "${GITHUB_BASE_URI}/download/v${PV}/avahi-${PV}.tar.gz \ file://CVE-2023-38473.patch \ file://CVE-2024-52616.patch \ file://CVE-2024-52615.patch \ + file://CVE-2025-68276.patch \ " GITHUB_BASE_URI = "https://github.com/avahi/avahi/releases/"; diff --git a/meta/recipes-connectivity/avahi/files/CVE-2025-68276.patch b/meta/recipes-connectivity/avahi/files/CVE-2025-68276.patch new file mode 100644 index 0000000000..75169419f1 --- /dev/null +++ b/meta/recipes-connectivity/avahi/files/CVE-2025-68276.patch @@ -0,0 +1,65 @@ +From 8ec85459d8e6e59cc14457e16fb7ba171901f90e Mon Sep 17 00:00:00 2001 +From: Evgeny Vereshchagin <[email protected]> +Date: Wed, 17 Dec 2025 08:11:23 +0000 +Subject: [PATCH] core: refuse to create wide-area record browsers when + wide-area is off + +It fixes a bug where it was possible for unprivileged local users to +crash avahi-daemon (with wide-area disabled) by creating record browsers +with the AVAHI_LOOKUP_USE_WIDE_AREA flag set via D-Bus (either by calling +the RecordBrowserNew method directly or by creating hostname/address/service +resolvers/browsers that create those browsers internally themselves). + +``` +$ gdbus call --system --dest org.freedesktop.Avahi --object-path / --method org.freedesktop.Avahi.Server.ResolveHostName -- -1 -1 yo.local -1 1 +Error: GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message recipient disconnected from message bus without replying +``` +``` +dbus-protocol.c: interface=org.freedesktop.Avahi.Server, path=/, member=ResolveHostName +avahi-daemon: wide-area.c:725: avahi_wide_area_scan_cache: Assertion `e' failed. +==307948== +==307948== Process terminating with default action of signal 6 (SIGABRT) +==307948== at 0x4B3630C: __pthread_kill_implementation (pthread_kill.c:44) +==307948== by 0x4ADF921: raise (raise.c:26) +==307948== by 0x4AC74AB: abort (abort.c:77) +==307948== by 0x4AC741F: __assert_fail_base.cold (assert.c:118) +==307948== by 0x48D8B85: avahi_wide_area_scan_cache (wide-area.c:725) +==307948== by 0x48C8953: lookup_scan_cache (browse.c:351) +==307948== by 0x48C8B1B: lookup_go (browse.c:386) +==307948== by 0x48C9148: defer_callback (browse.c:516) +==307948== by 0x48AEA0E: expiration_event (timeeventq.c:94) +==307948== by 0x489D3AE: timeout_callback (simple-watch.c:447) +==307948== by 0x489D787: avahi_simple_poll_dispatch (simple-watch.c:563) +==307948== by 0x489D91E: avahi_simple_poll_iterate (simple-watch.c:605) +==307948== +``` + +wide-area has been disabled by default since +9c4214146738146e454f098264690e8e884c39bd (v0.9-rc2). + +https://github.com/avahi/avahi/security/advisories/GHSA-mhf3-865v-g5rc + +CVE: CVE-2025-68276 +Upstream-Status: Backport [https://github.com/avahi/avahi/commit/2d48e42d44a183f26a4d12d1f5d41abb9b7c6355] +(cherry picked from commit 2d48e42d44a183f26a4d12d1f5d41abb9b7c6355) +Signed-off-by: Ankur Tyagi <[email protected]> +--- + avahi-core/browse.c | 5 +++++ + 1 file changed, 5 insertions(+) + +diff --git a/avahi-core/browse.c b/avahi-core/browse.c +index e8a915e..59d53cb 100644 +--- a/avahi-core/browse.c ++++ b/avahi-core/browse.c +@@ -541,6 +541,11 @@ AvahiSRecordBrowser *avahi_s_record_browser_prepare( + AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_FLAGS_VALID(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST), AVAHI_ERR_INVALID_FLAGS); + AVAHI_CHECK_VALIDITY_RETURN_NULL(server, !(flags & AVAHI_LOOKUP_USE_WIDE_AREA) || !(flags & AVAHI_LOOKUP_USE_MULTICAST), AVAHI_ERR_INVALID_FLAGS); + ++ if ((flags & AVAHI_LOOKUP_USE_WIDE_AREA) && !server->wide_area_lookup_engine) { ++ avahi_server_set_errno(server, AVAHI_ERR_NOT_SUPPORTED); ++ return NULL; ++ } ++ + if (!(b = avahi_new(AvahiSRecordBrowser, 1))) { + avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY); + return NULL;
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