76 lines
2.4 KiB
Diff
76 lines
2.4 KiB
Diff
From c77b31f1bcb8778007cfa584e15f3bb2f7135752 Mon Sep 17 00:00:00 2001
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From: Ralph Boehme <slow@samba.org>
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Date: Fri, 26 May 2023 13:06:19 +0200
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Subject: [PATCH 04/28] CVE-2023-34966: mdssvc: harden sl_unpack_loop()
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A malicious client could send a packet where subcount is zero, leading to a busy
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loop because
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count -= subcount
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=> count -= 0
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=> while (count > 0)
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loops forever.
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BUG: https://bugzilla.samba.org/show_bug.cgi?id=15340
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Signed-off-by: Ralph Boehme <slow@samba.org>
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Conflict: NA
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Reference: https://download.samba.org/pub/samba/patches/security/samba-4.17.10-security-2023-07-19.patch
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---
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source3/rpc_server/mdssvc/marshalling.c | 10 +++++-----
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1 file changed, 5 insertions(+), 5 deletions(-)
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diff --git a/source3/rpc_server/mdssvc/marshalling.c b/source3/rpc_server/mdssvc/marshalling.c
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index 9ba6ef571f2..d794ba15838 100644
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--- a/source3/rpc_server/mdssvc/marshalling.c
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+++ b/source3/rpc_server/mdssvc/marshalling.c
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@@ -1119,7 +1119,7 @@ static ssize_t sl_unpack_loop(DALLOC_CTX *query,
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sl_nil_t nil = 0;
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subcount = tag.count;
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- if (subcount > count) {
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+ if (subcount < 1 || subcount > count) {
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return -1;
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}
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for (i = 0; i < subcount; i++) {
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@@ -1147,7 +1147,7 @@ static ssize_t sl_unpack_loop(DALLOC_CTX *query,
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case SQ_TYPE_INT64:
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subcount = sl_unpack_ints(query, buf, offset, bufsize, encoding);
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- if (subcount == -1 || subcount > count) {
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+ if (subcount < 1 || subcount > count) {
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return -1;
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}
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offset += tag.size;
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@@ -1156,7 +1156,7 @@ static ssize_t sl_unpack_loop(DALLOC_CTX *query,
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case SQ_TYPE_UUID:
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subcount = sl_unpack_uuid(query, buf, offset, bufsize, encoding);
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- if (subcount == -1 || subcount > count) {
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+ if (subcount < 1 || subcount > count) {
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return -1;
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}
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offset += tag.size;
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@@ -1165,7 +1165,7 @@ static ssize_t sl_unpack_loop(DALLOC_CTX *query,
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case SQ_TYPE_FLOAT:
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subcount = sl_unpack_floats(query, buf, offset, bufsize, encoding);
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- if (subcount == -1 || subcount > count) {
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+ if (subcount < 1 || subcount > count) {
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return -1;
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}
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offset += tag.size;
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@@ -1174,7 +1174,7 @@ static ssize_t sl_unpack_loop(DALLOC_CTX *query,
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case SQ_TYPE_DATE:
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subcount = sl_unpack_date(query, buf, offset, bufsize, encoding);
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- if (subcount == -1 || subcount > count) {
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+ if (subcount < 1 || subcount > count) {
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return -1;
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}
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offset += tag.size;
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--
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2.34.1
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