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From 94cb6489114636940ac683515417990b55b5d66c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20Men=C5=A1=C3=ADk?= <pemensik@redhat.com>
Date: Tue, 11 Apr 2023 15:29:59 +0200
Subject: [PATCH] Ensure each label is at least one byte long
The only allowed exception is single dot, where it should return empty
string.
Fixes #454.
Upstream-Status: Backport [import from ubuntu https://git.launchpad.net/ubuntu/+source/avahi/tree/debian/patches/CVE-2023-38470-1.patch?h=ubuntu/focal-security
Upstream commit https://github.com/lathiat/avahi/commit/94cb6489114636940ac683515417990b55b5d66c]
CVE: CVE-2023-38470
Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
---
avahi-common/domain-test.c | 14 ++++++++++++++
avahi-common/domain.c | 2 +-
2 files changed, 15 insertions(+), 1 deletion(-)
Index: avahi-0.7/avahi-common/domain-test.c
===================================================================
--- avahi-0.7.orig/avahi-common/domain-test.c
+++ avahi-0.7/avahi-common/domain-test.c
@@ -45,6 +45,20 @@ int main(AVAHI_GCC_UNUSED int argc, AVAH
printf("%s\n", s = avahi_normalize_name_strdup("fo\\\\o\\..f oo."));
avahi_free(s);
+ printf("%s\n", s = avahi_normalize_name_strdup("."));
+ avahi_free(s);
+
+ s = avahi_normalize_name_strdup(",.=.}.=.?-.}.=.?.?.}.}.?.?.?.z.?.?.}.}."
+ "}.?.?.?.r.=.=.}.=.?.}}.}.?.?.?.zM.=.=.?.?.}.}.?.?.}.}.}"
+ ".?.?.?.r.=.=.}.=.?.}}.}.?.?.?.zM.=.=.?.?.}.}.?.?.?.zM.?`"
+ "?.}.}.}.?.?.?.r.=.?.}.=.?.?.}.?.?.?.}.=.?.?.}??.}.}.?.?."
+ "?.z.?.?.}.}.}.?.?.?.r.=.=.}.=.?.}}.}.?.?.?.zM.?`?.}.}.}."
+ "??.?.zM.?`?.}.}.}.?.?.?.r.=.?.}.=.?.?.}.?.?.?.}.=.?.?.}?"
+ "?.}.}.?.?.?.z.?.?.}.}.}.?.?.?.r.=.=.}.=.?.}}.}.?.?.?.zM."
+ "?`?.}.}.}.?.?.?.r.=.=.?.?`.?.?}.}.}.?.?.?.r.=.?.}.=.?.?."
+ "}.?.?.?.}.=.?.?.}");
+ assert(s == NULL);
+
printf("%i\n", avahi_domain_equal("\\065aa bbb\\.\\046cc.cc\\\\.dee.fff.", "Aaa BBB\\.\\.cc.cc\\\\.dee.fff"));
printf("%i\n", avahi_domain_equal("A", "a"));
Index: avahi-0.7/avahi-common/domain.c
===================================================================
--- avahi-0.7.orig/avahi-common/domain.c
+++ avahi-0.7/avahi-common/domain.c
@@ -201,7 +201,7 @@ char *avahi_normalize_name(const char *s
}
if (!empty) {
- if (size < 1)
+ if (size < 2)
return NULL;
*(r++) = '.';
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