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Fix CVE-2017-10788:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-10788
Patch written to match corrected documentation specifications:
Old: http://web.archive.org/web/20161220021610/https://dev.mysql.com/doc/refman/5.7/en/mysql-stmt-close.html
New: https://dev.mysql.com/doc/refman/5.7/en/mysql-stmt-close.html
The patch itself is from https://github.com/perl5-dbi/DBD-mysql/issues/120#issuecomment-312420660.
From 9ce10cfae7138c37c3a0cb2ba2a1d682482943d0 Mon Sep 17 00:00:00 2001
From: Pali <pali@cpan.org>
Date: Sun, 25 Jun 2017 10:07:39 +0200
Subject: [PATCH] Fix use-after-free after calling mysql_stmt_close()
Ignore return value from mysql_stmt_close() and also its error message
because it points to freed memory after mysql_stmt_close() was called.
---
dbdimp.c | 8 ++------
mysql.xs | 7 ++-----
2 files changed, 4 insertions(+), 11 deletions(-)
diff --git a/dbdimp.c b/dbdimp.c
index c60a5f6..a6410e5 100644
--- a/dbdimp.c
+++ b/dbdimp.c
@@ -4894,12 +4894,8 @@ void dbd_st_destroy(SV *sth, imp_sth_t *imp_sth) {
if (imp_sth->stmt)
{
- if (mysql_stmt_close(imp_sth->stmt))
- {
- do_error(DBIc_PARENT_H(imp_sth), mysql_stmt_errno(imp_sth->stmt),
- mysql_stmt_error(imp_sth->stmt),
- mysql_stmt_sqlstate(imp_sth->stmt));
- }
+ mysql_stmt_close(imp_sth->stmt);
+ imp_sth->stmt= NULL;
}
#endif
diff --git a/mysql.xs b/mysql.xs
index 55376e1..affde59 100644
--- a/mysql.xs
+++ b/mysql.xs
@@ -434,11 +434,8 @@ do(dbh, statement, attr=Nullsv, ...)
if (bind)
Safefree(bind);
- if(mysql_stmt_close(stmt))
- {
- fprintf(stderr, "\n failed while closing the statement");
- fprintf(stderr, "\n %s", mysql_stmt_error(stmt));
- }
+ mysql_stmt_close(stmt);
+ stmt= NULL;
if (retval == -2) /* -2 means error */
{
--
1.7.9.5
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