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avahi: fix CVE-2023-38469

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A vulnerability was found in Avahi, where a reachable assertion exists
in avahi_dns_packet_append_record.

(From OE-Core rev: 885d64f067b9ddaf890d9bdef7b76898ff90b04e)

Signed-off-by: Meenali Gupta <meenali.gupta@windriver.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Meenali Gupta
2023-11-16 11:17:12 +00:00
committed by Richard Purdie
parent 93a9621df3
commit 4dd9e54a3b
2 changed files with 49 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
meta/recipes-connectivity/avahi/avahi_0.8.bb
+1
View File
@@ -26,6 +26,7 @@ SRC_URI = "${GITHUB_BASE_URI}/download/v${PV}/avahi-${PV}.tar.gz \
file://handle-hup.patch \
file://local-ping.patch \
file://invalid-service.patch \
file://CVE-2023-38469.patch \
"
GITHUB_BASE_URI = "https://github.com/lathiat/avahi/releases/"
meta/recipes-connectivity/avahi/files/CVE-2023-38469.patch
+48
View File
@@ -0,0 +1,48 @@
From 72842945085cc3adaccfdfa2853771b0e75ef991 Mon Sep 17 00:00:00 2001
From: Evgeny Vereshchagin <evvers@ya.ru>
Date: Mon, 23 Oct 2023 20:29:31 +0000
Subject: [PATCH] avahi: core: reject overly long TXT resource records
Closes https://github.com/lathiat/avahi/issues/455
Upstream-Status: Backport [https://github.com/lathiat/avahi/commit/a337a1ba7d15853fb56deef1f464529af6e3a1cf]
CVE: CVE-2023-38469
Signed-off-by: Meenali Gupta <meenali.gupta@windriver.com>
---
avahi-core/rr.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/avahi-core/rr.c b/avahi-core/rr.c
index 7fa0bee..b03a24c 100644
--- a/avahi-core/rr.c
+++ b/avahi-core/rr.c
@@ -32,6 +32,7 @@
#include <avahi-common/malloc.h>
#include <avahi-common/defs.h>
+#include "dns.h"
#include "rr.h"
#include "log.h"
#include "util.h"
@@ -688,11 +689,17 @@ int avahi_record_is_valid(AvahiRecord *r) {
case AVAHI_DNS_TYPE_TXT: {
AvahiStringList *strlst;
+ size_t used = 0;
- for (strlst = r->data.txt.string_list; strlst; strlst = strlst->next)
+ for (strlst = r->data.txt.string_list; strlst; strlst = strlst->next) {
if (strlst->size > 255 || strlst->size <= 0)
return 0;
+ used += 1+strlst->size;
+ if (used > AVAHI_DNS_RDATA_MAX)
+ return 0;
+ }
+
return 1;
}
}
--
2.40.0