Fix CVE-2023-27320.

backport-CVE-2023-27320.patch

@@ -0,0 +1,38 @@
+diff --git a/plugins/sudoers/match_command.c b/plugins/sudoers/match_command.c
+index 37d376d..bda7082 100644
+--- a/plugins/sudoers/match_command.c
++++ b/plugins/sudoers/match_command.c
+@@ -818,12 +818,16 @@ command_matches(const char *sudoers_cmnd, const char *sudoers_args,
+ 	/* Rule-specific runchroot, reset user_cmnd and user_stat. */
+ 	int status;
+ 
++	/* Save old user_cmnd first, set_cmnd_path() will free it. */
+ 	saved_user_cmnd = user_cmnd;
++	user_cmnd = NULL;
+ 	if (user_stat != NULL)
+ 	    saved_user_stat = *user_stat;
+ 	status = set_cmnd_path(runchroot);
+-	if (status != FOUND)
++	if (status != FOUND) {
++	    user_cmnd = saved_user_cmnd;
+ 	    saved_user_cmnd = NULL;
++	}
+ 	if (info != NULL)
+ 	    info->status = status;
+     }
+diff --git a/plugins/sudoers/visudo.c b/plugins/sudoers/visudo.c
+index 3f43382..ec8deab 100644
+--- a/plugins/sudoers/visudo.c
++++ b/plugins/sudoers/visudo.c
+@@ -260,7 +260,9 @@ main(int argc, char *argv[])
+     }
+ 
+     /* Mock up a fake sudo_user struct. */
+-    user_cmnd = user_base = (char *)"";
++    user_cmnd = user_base = strdup("true");
++    if (user_cmnd == NULL)
++	sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+     if (geteuid() == 0) {
+ 	const char *user = getenv("SUDO_USER");
+ 	if (user != NULL && *user != '\0')
+

sudo.spec

@@ -1,6 +1,6 @@
 Name: sudo
 Version: 1.9.12p2
-Release: 2
+Release: 3
 Summary: Allows restricted root access for specified users
 License: ISC
 URL: https://www.sudo.ws
@@ -10,6 +10,8 @@ Source1: sudoers
 Source2: sudo
 Source3: sudo-i
 
+Patch0:  backport-CVE-2023-27320.patch
+
 Buildroot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 Requires: pam
 Recommends: vim-minimal
@@ -153,6 +155,9 @@ chrpath -d $RPM_BUILD_ROOT/usr/libexec/sudo/*
 %exclude %{_pkgdocdir}/ChangeLog
 
 %changelog
+* Fri Mar 10 2023 wangyu <wangyu283@huawei.com> - 1.9.12p2-3
+- Fix CVE-2023-27320.
+
 * Mon Mar 06 2023 wangyu <wangyu283@huawei.com> - 1.9.12p2-2
 - Remove -rpath option.