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avahi-CVE-2023-38469.patch
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46
avahi-CVE-2023-38469.patch
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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] 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 2bb8924..9c04ebb 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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--
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2.44.0
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71
avahi-CVE-2023-38471.patch
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71
avahi-CVE-2023-38471.patch
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From 894f085f402e023a98cbb6f5a3d117bd88d93b09 Mon Sep 17 00:00:00 2001
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From: Michal Sekletar <msekleta@redhat.com>
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Date: Mon, 23 Oct 2023 13:38:35 +0200
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Subject: [PATCH] core: extract host name using avahi_unescape_label()
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Previously we could create invalid escape sequence when we split the
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string on dot. For example, from valid host name "foo\\.bar" we have
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created invalid name "foo\\" and tried to set that as the host name
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which crashed the daemon.
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Fixes #453
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CVE-2023-38471
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---
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avahi-core/server.c | 27 +++++++++++++++++++++------
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1 file changed, 21 insertions(+), 6 deletions(-)
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diff --git a/avahi-core/server.c b/avahi-core/server.c
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index c32637a..f6a21bb 100644
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--- a/avahi-core/server.c
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+++ b/avahi-core/server.c
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@@ -1295,7 +1295,11 @@ static void update_fqdn(AvahiServer *s) {
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}
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int avahi_server_set_host_name(AvahiServer *s, const char *host_name) {
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- char *hn = NULL;
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+ char label_escaped[AVAHI_LABEL_MAX*4+1];
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+ char label[AVAHI_LABEL_MAX];
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+ char *hn = NULL, *h;
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+ size_t len;
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+
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assert(s);
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AVAHI_CHECK_VALIDITY(s, !host_name || avahi_is_valid_host_name(host_name), AVAHI_ERR_INVALID_HOST_NAME);
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@@ -1305,17 +1309,28 @@ int avahi_server_set_host_name(AvahiServer *s, const char *host_name) {
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else
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hn = avahi_normalize_name_strdup(host_name);
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- hn[strcspn(hn, ".")] = 0;
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+ h = hn;
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+ if (!avahi_unescape_label((const char **)&hn, label, sizeof(label))) {
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+ avahi_free(h);
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+ return AVAHI_ERR_INVALID_HOST_NAME;
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+ }
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+
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+ avahi_free(h);
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+
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+ h = label_escaped;
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+ len = sizeof(label_escaped);
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+ if (!avahi_escape_label(label, strlen(label), &h, &len))
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+ return AVAHI_ERR_INVALID_HOST_NAME;
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- if (avahi_domain_equal(s->host_name, hn) && s->state != AVAHI_SERVER_COLLISION) {
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- avahi_free(hn);
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+ if (avahi_domain_equal(s->host_name, label_escaped) && s->state != AVAHI_SERVER_COLLISION)
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return avahi_server_set_errno(s, AVAHI_ERR_NO_CHANGE);
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- }
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withdraw_host_rrs(s);
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avahi_free(s->host_name);
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- s->host_name = hn;
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+ s->host_name = avahi_strdup(label_escaped);
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+ if (!s->host_name)
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+ return AVAHI_ERR_NO_MEMORY;
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update_fqdn(s);
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--
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2.44.0
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@ -1,3 +1,11 @@
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-------------------------------------------------------------------
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Tue Mar 26 02:28:37 UTC 2024 - Xiaoguang Wang <xiaoguang.wang@suse.com>
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- Add avahi-CVE-2023-38471.patch: Extract host name using
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avahi_unescape_label (bsc#1216594, CVE-2023-38471).
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- Add avahi-CVE-2023-38469.patch: Reject overly long TXT resource
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records (bsc#1216598, CVE-2023-38469).
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-------------------------------------------------------------------
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Thu Nov 30 05:23:33 UTC 2023 - Alynx Zhou <alynx.zhou@suse.com>
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@ -107,6 +107,10 @@ Patch31: avahi-CVE-2023-38473.patch
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Patch32: avahi-CVE-2023-38470.patch
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# PATCH-FIX-UPSTREAM avahi-CVE-2023-38472.patch bsc#1216853 alynx.zhou@suse.com -- Fix reachable assertion in avahi_rdata_parse
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Patch33: avahi-CVE-2023-38472.patch
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# PATCH-FIX-UPSTREAM avahi-CVE-2023-38469.patch bsc#1216598 xwang@suse.com -- Reject overly long TXT resource records
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Patch34: avahi-CVE-2023-38469.patch
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# PATCH-FIX-UPSTREAM avahi-CVE-2023-38471.patch bsc#1216594 xwang@suse.com -- Extract host name using avahi_unescape_label
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Patch35: avahi-CVE-2023-38471.patch
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BuildRequires: fdupes
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BuildRequires: gcc-c++
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BuildRequires: gdbm-devel
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