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44 lines
1.2 KiB
Diff
44 lines
1.2 KiB
Diff
From a337a1ba7d15853fb56deef1f464529af6e3a1cf Mon Sep 17 00:00:00 2001
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From: Evgeny Vereshchagin <evvers@ya.ru>
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Date: Mon, 23 Oct 2023 20:29:31 +0000
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Subject: [PATCH 1/2] core: reject overly long TXT resource records
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Closes https://github.com/lathiat/avahi/issues/455
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CVE-2023-38469
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---
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avahi-core/rr.c | 9 ++++++++-
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1 file changed, 8 insertions(+), 1 deletion(-)
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diff --git a/avahi-core/rr.c b/avahi-core/rr.c
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index 2bb892445..9c04ebbdb 100644
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--- a/avahi-core/rr.c
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+++ b/avahi-core/rr.c
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@@ -32,6 +32,7 @@
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#include <avahi-common/malloc.h>
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#include <avahi-common/defs.h>
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+#include "dns.h"
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#include "rr.h"
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#include "log.h"
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#include "util.h"
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@@ -689,11 +690,17 @@ int avahi_record_is_valid(AvahiRecord *r) {
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case AVAHI_DNS_TYPE_TXT: {
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AvahiStringList *strlst;
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+ size_t used = 0;
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- for (strlst = r->data.txt.string_list; strlst; strlst = strlst->next)
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+ for (strlst = r->data.txt.string_list; strlst; strlst = strlst->next) {
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if (strlst->size > 255 || strlst->size <= 0)
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return 0;
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+ used += 1+strlst->size;
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+ if (used > AVAHI_DNS_RDATA_MAX)
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+ return 0;
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+ }
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+
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return 1;
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}
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}
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