49 lines
2.1 KiB
Diff
49 lines
2.1 KiB
Diff
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From 77e0f2febaaf4d6e5e42f8e73a1f8f3c0e4a2985 Mon Sep 17 00:00:00 2001
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From: Joseph Sutton <josephsutton@catalyst.net.nz>
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Date: Mon, 10 Oct 2022 20:33:09 +1300
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Subject: [PATCH 14/15] CVE-2022-3437 source4/heimdal: Check for overflow in
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_gsskrb5_get_mech()
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If len_len is equal to total_len - 1 (i.e. the input consists only of a
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0x60 byte and a length), the expression 'total_len - 1 - len_len - 1',
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used as the 'len' parameter to der_get_length(), will overflow to
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SIZE_MAX. Then der_get_length() will proceed to read, unconstrained,
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whatever data follows in memory. Add a check to ensure that doesn't
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happen.
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BUG: https://bugzilla.samba.org/show_bug.cgi?id=15134
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Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
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Reviewed-by: Andrew Bartlett <abartlet@samba.org>
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Conflict: NA
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Reference: https://download.samba.org/pub/samba/patches/security/samba-4.15.11-security-2022-10-25.patch
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---
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selftest/knownfail.d/heimdal-des-overflow | 1 -
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source4/heimdal/lib/gssapi/krb5/decapsulate.c | 2 ++
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2 files changed, 2 insertions(+), 1 deletion(-)
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diff --git a/selftest/knownfail.d/heimdal-des-overflow b/selftest/knownfail.d/heimdal-des-overflow
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index 94a49bbee7f..a7416dc61d9 100644
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--- a/selftest/knownfail.d/heimdal-des-overflow
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+++ b/selftest/knownfail.d/heimdal-des-overflow
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@@ -1,3 +1,2 @@
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-^samba.unittests.auth.heimdal_gensec_unwrap_des.test_unwrap_truncated_header_0.none
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^samba.unittests.auth.heimdal_gensec_unwrap_des.test_unwrap_with_padding_truncated_0.none
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^samba.unittests.auth.heimdal_gensec_unwrap_des.test_unwrap_with_padding_truncated_1.none
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diff --git a/source4/heimdal/lib/gssapi/krb5/decapsulate.c b/source4/heimdal/lib/gssapi/krb5/decapsulate.c
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index 031a621eabc..d7b75a64222 100644
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--- a/source4/heimdal/lib/gssapi/krb5/decapsulate.c
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+++ b/source4/heimdal/lib/gssapi/krb5/decapsulate.c
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@@ -54,6 +54,8 @@ _gsskrb5_get_mech (const u_char *ptr,
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e = der_get_length (p, total_len - 1, &len, &len_len);
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if (e || 1 + len_len + len != total_len)
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return -1;
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+ if (total_len < 1 + len_len + 1)
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+ return -1;
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p += len_len;
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if (*p++ != 0x06)
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return -1;
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--
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2.25.1
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