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package/libcoap: fix CVE-2024-0962

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A vulnerability was found in obgm libcoap 4.3.4. It has been rated as
critical. Affected by this issue is the function get_split_entry of the
file src/coap_oscore.c of the component Configuration File Handler. The
manipulation leads to stack-based buffer overflow. The attack may be
launched remotely. The exploit has been disclosed to the public and may
be used. It is recommended to apply a patch to fix this issue.
VDB-252206 is the identifier assigned to this vulnerability.

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Fabrice Fontaine 2024-03-01 21:22:57 +01:00 committed by Peter Korsgaard
parent b1b4923d18
commit 9002b818be
2 changed files with 41 additions and 0 deletions
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38
package/libcoap/0001-coap_oscore-c-Fix-parsing-OSCORE-configuration-information.patch Normal file
View File

@ -0,0 +1,38 @@
From 2b28d8b0e9607e71a145345b4fe49517e052b7d9 Mon Sep 17 00:00:00 2001
From: Jon Shallow <supjps-libcoap@jpshallow.com>
Date: Thu, 25 Jan 2024 18:03:17 +0000
Subject: [PATCH] coap_oscore.c: Fix parsing OSCORE configuration information
Upstream: https://github.com/obgm/libcoap/commit/2b28d8b0e9607e71a145345b4fe49517e052b7d9
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
---
src/coap_oscore.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/src/coap_oscore.c b/src/coap_oscore.c
index 83f785c92..e0fb22947 100644
--- a/src/coap_oscore.c
+++ b/src/coap_oscore.c
@@ -1678,11 +1678,12 @@ get_split_entry(const char **start,
oscore_value_t *value) {
const char *begin = *start;
const char *end;
+ const char *kend;
const char *split;
size_t i;
retry:
- end = memchr(begin, '\n', size);
+ kend = end = memchr(begin, '\n', size);
if (end == NULL)
return 0;
@@ -1693,7 +1694,7 @@ get_split_entry(const char **start,
if (begin[0] == '#' || (end - begin) == 0) {
/* Skip comment / blank line */
- size -= end - begin + 1;
+ size -= kend - begin + 1;
begin = *start;
goto retry;
}

3
package/libcoap/libcoap.mk
View File

@ -15,6 +15,9 @@ LIBCOAP_CONF_OPTS = \
--disable-examples --disable-examples-source --without-tinydtls
LIBCOAP_AUTORECONF = YES
# 0001-coap_oscore-c-Fix-parsing-OSCORE-configuration-information.patch
LIBCOAP_IGNORE_CVES += CVE-2024-0962
ifeq ($(BR2_PACKAGE_GNUTLS),y)
LIBCOAP_DEPENDENCIES += gnutls
LIBCOAP_CONF_OPTS += \