46 lines
1.5 KiB
Diff
46 lines
1.5 KiB
Diff
From 7d9b7157234e628ecc32baab16a09eef666962d5 Mon Sep 17 00:00:00 2001
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From: Mark Reynolds <mreynolds@redhat.com>
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Date: Wed, 3 Jun 2026 17:52:09 -0400
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Subject: [PATCH] Issue 7554 - deref plugin null pointer dereference if
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ber_init fails
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Description:
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**CWE**: CWE-476 (NULL Pointer Dereference)
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A flaw in the 389 Directory Server's dereference control plugin allows an
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unauthenticated attacker to crash the LDAP server when the system is under
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memory pressure(OOM). The deref plugin, enabled by default, fails to check for
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a memory allocation failure before using the result, causing the server
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process to terminate.
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CI test 'test_deref_and_access_control' already covers this fix.
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relates: https://github.com/389ds/389-ds-base/issues/7554
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Reviewed by: tbordaz & progier(Thanks!!)
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---
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ldap/servers/plugins/deref/deref.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/ldap/servers/plugins/deref/deref.c b/ldap/servers/plugins/deref/deref.c
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index fc1c10f71..fc157f6d6 100644
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--- a/ldap/servers/plugins/deref/deref.c
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+++ b/ldap/servers/plugins/deref/deref.c
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@@ -357,6 +357,12 @@ deref_parse_ctrl_value(DerefSpecList *speclist, const struct berval *ctrlbv, int
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}
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ber = ber_init((struct berval *)ctrlbv);
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+ if (!ber) {
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+ *ldapcode = LDAP_UNWILLING_TO_PERFORM;
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+ *ldaperrtext = "Deref control parsing failed to initialize BER element";
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+ return;
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+ }
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+
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for (tag = ber_first_element(ber, &len, &last);
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(tag != LBER_ERROR) && (tag != LBER_END_OF_SEQORSET);
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tag = ber_next_element(ber, &len, last)) {
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--
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2.55.0
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