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From 4b0dd469bbba7bf5f25f1a4f694aeb15c3515be4 Mon Sep 17 00:00:00 2001
From: Saki Takamachi <saki@sakiot.com>
Date: Sun, 3 May 2026 19:56:30 +0200
Subject: [PATCH 07/10] GHSA-w476-322c-wpvm: [pdo_firebird] Fix SQL injection
via NUL bytes in quoted strings
Fixes GHSA-w476-322c-wpvm
Fixes CVE-2025-14179
(cherry picked from commit 3f40b65323dd1b85e9bab6878237d3867e449d5c)
---
ext/pdo_firebird/firebird_driver.c | 69 ++++++++++++-------
.../tests/ghsa-w476-322c-wpvm.phpt | 44 ++++++++++++
2 files changed, 88 insertions(+), 25 deletions(-)
create mode 100644 ext/pdo_firebird/tests/ghsa-w476-322c-wpvm.phpt
diff --git a/ext/pdo_firebird/firebird_driver.c b/ext/pdo_firebird/firebird_driver.c
index a446622c90e..25882919f86 100644
--- a/ext/pdo_firebird/firebird_driver.c
+++ b/ext/pdo_firebird/firebird_driver.c
@@ -291,7 +291,7 @@ static FbTokenType getToken(const char** begin, const char* end)
return ret;
}
-int preprocess(const zend_string* sql, char* sql_out, HashTable* named_params)
+int preprocess(const zend_string* sql, char* sql_out, size_t* sql_out_len, HashTable* named_params)
{
bool passAsIs = 1, execBlock = 0;
zend_long pindex = -1;
@@ -322,7 +322,7 @@ int preprocess(const zend_string* sql, char* sql_out, HashTable* named_params)
if (l > 252) {
return 0;
}
- strncpy(ident, i, l);
+ memcpy(ident, i, l);
ident[l] = '\0';
if (!strcasecmp(ident, "EXECUTE"))
{
@@ -347,7 +347,7 @@ int preprocess(const zend_string* sql, char* sql_out, HashTable* named_params)
if (l > 252) {
return 0;
}
- strncpy(ident2, i2, l);
+ memcpy(ident2, i2, l);
ident2[l] = '\0';
execBlock = !strcasecmp(ident2, "BLOCK");
passAsIs = 0;
@@ -363,11 +363,15 @@ int preprocess(const zend_string* sql, char* sql_out, HashTable* named_params)
if (passAsIs)
{
- strcpy(sql_out, ZSTR_VAL(sql));
+ memcpy(sql_out, ZSTR_VAL(sql), ZSTR_LEN(sql));
+ sql_out[ZSTR_LEN(sql)] = '\0';
+ *sql_out_len = ZSTR_LEN(sql);
return 1;
}
- strncat(sql_out, start, p - start);
+ char *sql_out_p = sql_out;
+ memcpy(sql_out_p, start, p - start);
+ sql_out_p += p - start;
while (p < end)
{
@@ -375,10 +379,12 @@ int preprocess(const zend_string* sql, char* sql_out, HashTable* named_params)
tok = getToken(&p, end);
switch (tok)
{
- case ttParamMark:
- tok = getToken(&p, end);
+ case ttParamMark: {
+ const char* p_peek = p;
+ tok = getToken(&p_peek, end);
if (tok == ttIdent /*|| tok == ttString*/)
{
+ p = p_peek;
++pindex;
l = p - start;
/* check the length of the identifier */
@@ -387,7 +393,7 @@ int preprocess(const zend_string* sql, char* sql_out, HashTable* named_params)
if (l > 253) {
return 0;
}
- strncpy(pname, start, l);
+ memcpy(pname, start, l);
pname[l] = '\0';
if (named_params) {
@@ -396,7 +402,7 @@ int preprocess(const zend_string* sql, char* sql_out, HashTable* named_params)
zend_hash_str_update(named_params, pname, l, &tmp);
}
- strcat(sql_out, "?");
+ *sql_out_p++ = '?';
}
else
{
@@ -406,10 +412,11 @@ int preprocess(const zend_string* sql, char* sql_out, HashTable* named_params)
return 0;
}
++pindex;
- strncat(sql_out, start, p - start);
+ memcpy(sql_out_p, start, p - start);
+ sql_out_p += p - start;
}
break;
-
+ }
case ttIdent:
if (execBlock)
{
@@ -421,11 +428,14 @@ int preprocess(const zend_string* sql, char* sql_out, HashTable* named_params)
if (l > 252) {
return 0;
}
- strncpy(ident, start, l);
+ memcpy(ident, start, l);
ident[l] = '\0';
if (!strcasecmp(ident, "AS"))
{
- strncat(sql_out, start, end - start);
+ memcpy(sql_out_p, start, end - start);
+ sql_out_p += end - start;
+ *sql_out_p = '\0';
+ *sql_out_len = sql_out_p - sql_out;
return 1;
}
}
@@ -436,7 +446,8 @@ int preprocess(const zend_string* sql, char* sql_out, HashTable* named_params)
case ttComment:
case ttString:
case ttOther:
- strncat(sql_out, start, p - start);
+ memcpy(sql_out_p, start, p - start);
+ sql_out_p += p - start;
break;
case ttBrokenComment:
@@ -454,6 +465,8 @@ int preprocess(const zend_string* sql, char* sql_out, HashTable* named_params)
break;
}
}
+ *sql_out_p = '\0';
+ *sql_out_len = sql_out_p - sql_out;
return 1;
}
@@ -663,7 +676,7 @@ free_statement:
static zend_string* firebird_handle_quoter(pdo_dbh_t *dbh, const zend_string *unquoted, enum pdo_param_type paramtype)
{
size_t qcount = 0;
- char const *co, *l, *r;
+ char const *co, *l;
char *c;
size_t quotedlen;
zend_string *quoted_str;
@@ -672,9 +685,15 @@ static zend_string* firebird_handle_quoter(pdo_dbh_t *dbh, const zend_string *un
return zend_string_init("''", 2, 0);
}
+ const char * const end = ZSTR_VAL(unquoted) + ZSTR_LEN(unquoted);
+
/* Firebird only requires single quotes to be doubled if string lengths are used */
/* count the number of ' characters */
- for (co = ZSTR_VAL(unquoted); (co = strchr(co,'\'')); qcount++, co++);
+ for (co = ZSTR_VAL(unquoted); co < end; co++) {
+ if (*co == '\'') {
+ qcount++;
+ }
+ }
if (UNEXPECTED(ZSTR_LEN(unquoted) + 2 > ZSTR_MAX_LEN - qcount)) {
return NULL;
@@ -686,15 +705,14 @@ static zend_string* firebird_handle_quoter(pdo_dbh_t *dbh, const zend_string *un
*c++ = '\'';
/* foreach (chunk that ends in a quote) */
- for (l = ZSTR_VAL(unquoted); (r = strchr(l,'\'')); l = r+1) {
- strncpy(c, l, r-l+1);
- c += (r-l+1);
- /* add the second quote */
- *c++ = '\'';
+ for (l = ZSTR_VAL(unquoted); l < end; l++) {
+ *c++ = *l;
+ if (*l == '\'') {
+ /* add the second quote */
+ *c++ = '\'';
+ }
}
- /* copy the remainder */
- strncpy(c, l, quotedlen-(c-ZSTR_VAL(quoted_str))-1);
ZSTR_VAL(quoted_str)[quotedlen-1] = '\'';
ZSTR_VAL(quoted_str)[quotedlen] = '\0';
@@ -787,6 +805,7 @@ static int firebird_alloc_prepare_stmt(pdo_dbh_t *dbh, const zend_string *sql,
{
pdo_firebird_db_handle *H = (pdo_firebird_db_handle *)dbh->driver_data;
char *new_sql;
+ size_t new_sql_len;
/* Firebird allows SQL statements up to 64k, so bail if it doesn't fit */
if (ZSTR_LEN(sql) > 65536) {
@@ -814,14 +833,14 @@ static int firebird_alloc_prepare_stmt(pdo_dbh_t *dbh, const zend_string *sql,
we need to replace :foo by ?, and store the name we just replaced */
new_sql = emalloc(ZSTR_LEN(sql)+1);
new_sql[0] = '\0';
- if (!preprocess(sql, new_sql, named_params)) {
+ if (!preprocess(sql, new_sql, &new_sql_len, named_params)) {
strcpy(dbh->error_code, "07000");
efree(new_sql);
return 0;
}
/* prepare the statement */
- if (isc_dsql_prepare(H->isc_status, &H->tr, s, 0, new_sql, H->sql_dialect, out_sqlda)) {
+ if (isc_dsql_prepare(H->isc_status, &H->tr, s, new_sql_len, new_sql, H->sql_dialect, out_sqlda)) {
RECORD_ERROR(dbh);
efree(new_sql);
return 0;
diff --git a/ext/pdo_firebird/tests/ghsa-w476-322c-wpvm.phpt b/ext/pdo_firebird/tests/ghsa-w476-322c-wpvm.phpt
new file mode 100644
index 00000000000..41c1125e9b9
--- /dev/null
+++ b/ext/pdo_firebird/tests/ghsa-w476-322c-wpvm.phpt
@@ -0,0 +1,44 @@
+--TEST--
+GHSA-w476-322c-wpvm: SQL injection in pdo_firebird via NUL bytes in quoted strings
+--EXTENSIONS--
+pdo_firebird
+--SKIPIF--
+<?php require('skipif.inc'); ?>
+--XLEAK--
+A bug in firebird causes a memory leak when calling `isc_attach_database()`.
+See https://github.com/FirebirdSQL/firebird/issues/7849
+--FILE--
+<?php
+
+require("testdb.inc");
+
+$dbh->exec('CREATE TABLE ghsa_w476_322c_wpvm (name VARCHAR(255))');
+
+$param = $dbh->quote("\0");
+$param2 = $dbh->quote('or 1=1--');
+var_export($param);
+echo("\n");
+
+echo "prepare: ";
+$stmt = $dbh->prepare("SELECT * FROM ghsa_w476_322c_wpvm WHERE name = {$param} AND name = {$param2}");
+$stmt->execute();
+echo json_encode($stmt->fetchAll(PDO::FETCH_ASSOC)) . "\n";
+
+echo "query: ";
+$stmt = $dbh->query("SELECT * FROM ghsa_w476_322c_wpvm WHERE name = {$param} AND name = {$param2}");
+echo json_encode($stmt->fetchAll(PDO::FETCH_ASSOC)) . "\n";
+
+echo "exec: ";
+$affectedRows = $dbh->exec("UPDATE ghsa_w476_322c_wpvm SET name = 'updated' WHERE name = {$param} AND name = {$param2}");
+echo $affectedRows . "\n";
+?>
+--CLEAN--
+<?php
+require 'testdb.inc';
+$dbh->exec("DROP TABLE ghsa_w476_322c_wpvm");
+?>
+--EXPECT--
+'\'' . "\0" . '\''
+prepare: []
+query: []
+exec: 0
--
2.54.0
|
