blob: 143b6b3841494d5b15b3d1b4f8a7afe5e43029ea (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
From b04cb88462863d762093760ffcfe1946200e30f5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20Sur=C3=BD?= <ondrej@isc.org>
Date: Thu, 7 Jan 2021 10:44:46 +0100
Subject: [PATCH] Fix off-by-one bug in ISC SPNEGO implementation
The ISC SPNEGO implementation is based on mod_auth_kerb code. When
CVE-2006-5989 was disclosed, the relevant fix was not applied to the
BIND 9 codebase, making the latter vulnerable to the aforementioned flaw
when "tkey-gssapi-keytab" or "tkey-gssapi-credential" is set in
named.conf.
The original description of CVE-2006-5989 was:
Off-by-one error in the der_get_oid function in mod_auth_kerb 5.0
allows remote attackers to cause a denial of service (crash) via a
crafted Kerberos message that triggers a heap-based buffer overflow
in the component array.
Later research revealed that this flaw also theoretically enables remote
code execution, though achieving the latter in real-world conditions is
currently deemed very difficult.
This vulnerability was responsibly reported as ZDI-CAN-12302 ("ISC BIND
TKEY Query Heap-based Buffer Overflow Remote Code Execution
Vulnerability") by Trend Micro Zero Day Initiative.
---
lib/dns/spnego.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/dns/spnego.c b/lib/dns/spnego.c
index e61d1c600f..753dc8049f 100644
--- a/lib/dns/spnego.c
+++ b/lib/dns/spnego.c
@@ -848,7 +848,7 @@ der_get_oid(const unsigned char *p, size_t len, oid *data, size_t *size) {
return (ASN1_OVERRUN);
}
- data->components = malloc(len * sizeof(*data->components));
+ data->components = malloc((len + 1) * sizeof(*data->components));
if (data->components == NULL) {
return (ENOMEM);
}
--
GitLab
|
