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From f6edaafcfefd843ca1b1a041f942a853d85ee7c3 Mon Sep 17 00:00:00 2001
From: Joseph Sutton <josephsutton@catalyst.net.nz>
Date: Wed, 12 Oct 2022 13:57:13 +1300
Subject: [PATCH] gsskrb5: CVE-2022-3437 Use constant-time memcmp() for arcfour
unwrap
Samba BUG: https://bugzilla.samba.org/show_bug.cgi?id=15134
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Upstream-Status: Backport [https://github.com/heimdal/heimdal/commit/f6edaafcfefd843ca1b1a041f942a853d85ee7c3]
CVE: CVE-2022-3437
Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
---
lib/gssapi/krb5/arcfour.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/lib/gssapi/krb5/arcfour.c b/lib/gssapi/krb5/arcfour.c
index a61f768..4fc46ce 100644
--- a/lib/gssapi/krb5/arcfour.c
+++ b/lib/gssapi/krb5/arcfour.c
@@ -365,7 +365,7 @@ _gssapi_verify_mic_arcfour(OM_uint32 * minor_status,
return GSS_S_FAILURE;
}
- cmp = ct_memcmp(cksum_data, p + 8, 8);
+ cmp = (ct_memcmp(cksum_data, p + 8, 8) == 0);
if (cmp) {
*minor_status = 0;
return GSS_S_BAD_MIC;
@@ -385,9 +385,9 @@ _gssapi_verify_mic_arcfour(OM_uint32 * minor_status,
_gsskrb5_decode_be_om_uint32(SND_SEQ, &seq_number);
if (context_handle->more_flags & LOCAL)
- cmp = memcmp(&SND_SEQ[4], "\xff\xff\xff\xff", 4);
+ cmp = (ct_memcmp(&SND_SEQ[4], "\xff\xff\xff\xff", 4) != 0);
else
- cmp = memcmp(&SND_SEQ[4], "\x00\x00\x00\x00", 4);
+ cmp = (ct_memcmp(&SND_SEQ[4], "\x00\x00\x00\x00", 4) != 0);
memset(SND_SEQ, 0, sizeof(SND_SEQ));
if (cmp != 0) {
@@ -656,9 +656,9 @@ OM_uint32 _gssapi_unwrap_arcfour(OM_uint32 *minor_status,
_gsskrb5_decode_be_om_uint32(SND_SEQ, &seq_number);
if (context_handle->more_flags & LOCAL)
- cmp = memcmp(&SND_SEQ[4], "\xff\xff\xff\xff", 4);
+ cmp = (ct_memcmp(&SND_SEQ[4], "\xff\xff\xff\xff", 4) != 0);
else
- cmp = memcmp(&SND_SEQ[4], "\x00\x00\x00\x00", 4);
+ cmp = (ct_memcmp(&SND_SEQ[4], "\x00\x00\x00\x00", 4) != 0);
if (cmp != 0) {
*minor_status = 0;
@@ -730,7 +730,7 @@ OM_uint32 _gssapi_unwrap_arcfour(OM_uint32 *minor_status,
return GSS_S_FAILURE;
}
- cmp = ct_memcmp(cksum_data, p0 + 16, 8); /* SGN_CKSUM */
+ cmp = (ct_memcmp(cksum_data, p0 + 16, 8) == 0); /* SGN_CKSUM */
if (cmp) {
_gsskrb5_release_buffer(minor_status, output_message_buffer);
*minor_status = 0;
@@ -1266,9 +1266,9 @@ _gssapi_unwrap_iov_arcfour(OM_uint32 *minor_status,
_gsskrb5_decode_be_om_uint32(snd_seq, &seq_number);
if (ctx->more_flags & LOCAL) {
- cmp = memcmp(&snd_seq[4], "\xff\xff\xff\xff", 4);
+ cmp = (ct_memcmp(&snd_seq[4], "\xff\xff\xff\xff", 4) != 0);
} else {
- cmp = memcmp(&snd_seq[4], "\x00\x00\x00\x00", 4);
+ cmp = (ct_memcmp(&snd_seq[4], "\x00\x00\x00\x00", 4) != 0);
}
if (cmp != 0) {
*minor_status = 0;
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