57 lines
2.1 KiB
Diff
57 lines
2.1 KiB
Diff
From 7638abd38a13f9d2b5c769eb12c70eacf49b3806 Mon Sep 17 00:00:00 2001
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From: Joseph Sutton <josephsutton@catalyst.net.nz>
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Date: Tue, 7 Jun 2022 17:37:34 +1200
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Subject: [PATCH 12/15] CVE-2022-32743 dsdb/modules/acl: Account for
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sAMAccountName without $
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If we have an account without a trailing $, we should ensure the
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servicePrincipalName matches the entire sAMAccountName. We should not
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allow a match against the sAMAccountName prefix of length
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strlen(samAccountName) - 1, as that could conflict with a different
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account.
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BUG: https://bugzilla.samba.org/show_bug.cgi?id=14833
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Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
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Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
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---
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source4/dsdb/samdb/ldb_modules/acl.c | 12 ++++++++++--
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1 file changed, 10 insertions(+), 2 deletions(-)
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diff --git a/source4/dsdb/samdb/ldb_modules/acl.c b/source4/dsdb/samdb/ldb_modules/acl.c
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index a26d0ba..82f6ec3 100644
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--- a/source4/dsdb/samdb/ldb_modules/acl.c
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+++ b/source4/dsdb/samdb/ldb_modules/acl.c
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@@ -543,6 +543,7 @@ static int acl_validate_spn_value(TALLOC_CTX *mem_ctx,
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char *instanceName;
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char *serviceType;
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char *serviceName;
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+ size_t account_name_len;
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const char *forest_name = samdb_forest_name(ldb, mem_ctx);
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const char *base_domain = samdb_default_domain_name(ldb, mem_ctx);
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struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
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@@ -616,11 +617,18 @@ static int acl_validate_spn_value(TALLOC_CTX *mem_ctx,
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}
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}
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}
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+
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+ account_name_len = strlen(samAccountName);
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+ if (account_name_len && samAccountName[account_name_len - 1] == '$') {
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+ /* Account for the '$' character. */
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+ --account_name_len;
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+ }
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+
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/* instanceName can be samAccountName without $ or dnsHostName
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* or "ntds_guid._msdcs.forest_domain for DC objects */
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- if (strlen(instanceName) == (strlen(samAccountName) - 1)
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+ if (strlen(instanceName) == account_name_len
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&& strncasecmp(instanceName, samAccountName,
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- strlen(samAccountName) - 1) == 0) {
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+ account_name_len) == 0) {
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goto success;
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}
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if ((dnsHostName != NULL) &&
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--
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1.8.3.1
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