Fix CVE-2023-22809
(cherry picked from commit d346c81a024e9ab2c3407012aefeaa350dc21ca3)
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openeuler-sync-bot
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127
backport-CVE-2023-22809.patch
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127
backport-CVE-2023-22809.patch
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@ -0,0 +1,127 @@
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From 8bc287132be68c205b3770fcad513b0cc191a611 Mon Sep 17 00:00:00 2001
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From: "Todd C. Miller" <Todd.Miller@sudo.ws>
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Date: Thu, 12 Jan 2023 15:55:27 -0700
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Subject: [PATCH] sudoedit: do not permit editor arguments to include "--"
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(CVE-2023-22809) We use "--" to separate the editor and arguments from the
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files to edit. If the editor arguments include "--", sudo can be tricked into
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allowing the user to edit a file not permitted by the security policy. Thanks
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to Matthieu Barjole and Victor Cutillas of Synacktiv (https://synacktiv.com)
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for finding this bug.
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Reference:https://github.com/sudo-project/sudo/commit/0274a4f3b403162a37a10f199c989f3727ed3ad4
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Conflict:NA
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---
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plugins/sudoers/editor.c | 17 ++++++++++++++++-
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plugins/sudoers/sudoers.c | 24 +++++++++++++++++-------
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plugins/sudoers/visudo.c | 8 ++++++--
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3 files changed, 39 insertions(+), 10 deletions(-)
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diff --git a/plugins/sudoers/editor.c b/plugins/sudoers/editor.c
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index 3ff08c1..b65cbd9 100644
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--- a/plugins/sudoers/editor.c
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+++ b/plugins/sudoers/editor.c
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@@ -50,7 +50,7 @@ resolve_editor(const char *ed, size_t edlen, int nfiles, char **files,
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const char *cp, *ep, *tmp;
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const char *edend = ed + edlen;
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struct stat user_editor_sb;
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- int nargc;
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+ int nargc = 0;
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debug_decl(resolve_editor, SUDOERS_DEBUG_UTIL);
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/*
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@@ -99,6 +99,21 @@ resolve_editor(const char *ed, size_t edlen, int nfiles, char **files,
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free(nargv);
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debug_return_str(NULL);
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}
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+
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+ /*
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+ * We use "--" to separate the editor and arguments from the files
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+ * to edit. The editor arguments themselves may not contain "--".
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+ */
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+ if (strcmp(nargv[nargc], "--") == 0) {
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+ sudo_warnx(U_("ignoring editor: %.*s"), (int)edlen, ed);
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+ sudo_warnx("%s", U_("editor arguments may not contain \"--\""));
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+ errno = EINVAL;
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+ free(editor_path);
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+ while (nargc--)
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+ free(nargv[nargc]);
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+ free(nargv);
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+ debug_return_str(NULL);
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+ }
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}
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if (nfiles != 0) {
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nargv[nargc++] = "--";
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diff --git a/plugins/sudoers/sudoers.c b/plugins/sudoers/sudoers.c
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index 00a8ce5..14205cb 100644
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--- a/plugins/sudoers/sudoers.c
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+++ b/plugins/sudoers/sudoers.c
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@@ -655,21 +655,31 @@ sudoers_policy_main(int argc, char * const argv[], int pwflag, char *env_add[],
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/* Note: must call audit before uid change. */
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if (ISSET(sudo_mode, MODE_EDIT)) {
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+ const char *env_editor = NULL;
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char **edit_argv;
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int edit_argc;
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- const char *env_editor;
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free(safe_cmnd);
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safe_cmnd = find_editor(NewArgc - 1, NewArgv + 1, &edit_argc,
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&edit_argv, NULL, &env_editor, false);
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if (safe_cmnd == NULL) {
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- if (errno != ENOENT)
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+ switch (errno) {
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+ case ENOENT:
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+ audit_failure(NewArgv, N_("%s: command not found"),
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+ env_editor ? env_editor : def_editor);
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+ sudo_warnx(U_("%s: command not found"),
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+ env_editor ? env_editor : def_editor);
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+ goto bad;
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+ case EINVAL:
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+ if (def_env_editor && env_editor != NULL) {
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+ /* User tried to do something funny with the editor. */
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+ log_warningx(SLOG_NO_STDERR|SLOG_SEND_MAIL,
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+ "invalid user-specified editor: %s", env_editor);
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+ goto bad;
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+ }
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+ default:
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goto done;
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- audit_failure(NewArgv, N_("%s: command not found"),
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- env_editor ? env_editor : def_editor);
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- sudo_warnx(U_("%s: command not found"),
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- env_editor ? env_editor : def_editor);
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- goto bad;
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+ }
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}
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sudoers_gc_add(GC_VECTOR, edit_argv);
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NewArgv = edit_argv;
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diff --git a/plugins/sudoers/visudo.c b/plugins/sudoers/visudo.c
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index 2c64680..b79fc19 100644
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--- a/plugins/sudoers/visudo.c
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+++ b/plugins/sudoers/visudo.c
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@@ -304,7 +304,7 @@ static char *
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get_editor(int *editor_argc, char ***editor_argv)
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{
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char *editor_path = NULL, **whitelist = NULL;
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- const char *env_editor;
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+ const char *env_editor = NULL;
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static char *files[] = { "+1", "sudoers" };
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unsigned int whitelist_len = 0;
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debug_decl(get_editor, SUDOERS_DEBUG_UTIL);
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@@ -338,7 +338,11 @@ get_editor(int *editor_argc, char ***editor_argv)
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if (editor_path == NULL) {
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if (def_env_editor && env_editor != NULL) {
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/* We are honoring $EDITOR so this is a fatal error. */
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- sudo_fatalx(U_("specified editor (%s) doesn't exist"), env_editor);
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+ if (errno == ENOENT) {
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+ sudo_warnx(U_("specified editor (%s) doesn't exist"),
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+ env_editor);
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+ }
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+ exit(EXIT_FAILURE);
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}
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sudo_fatalx(U_("no editor found (editor path = %s)"), def_editor);
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}
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--
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2.33.0
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@ -1,6 +1,6 @@
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Name: sudo
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Version: 1.9.2
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Release: 9
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Release: 10
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Summary: Allows restricted root access for specified users
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License: ISC
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URL: http://www.courtesan.com/sudo/
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@ -33,6 +33,7 @@ Patch19: backport-cvtsudoers-Prevent-sudo-from-reading-into-undefined-.patch
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Patch20: backport-Fix-a-potential-use-after-free-bug-with-cvtsudoers-f.patch
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Patch21: backport-Fix-memory-leak-of-pass-in-converse.patch
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Patch22: backport-sudo_passwd_cleanup-Set-auth-data-to-NULL-after-free.patch
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Patch23: backport-CVE-2023-22809.patch
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Buildroot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
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Requires: pam
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@ -173,6 +174,9 @@ install -p -c -m 0644 %{SOURCE3} $RPM_BUILD_ROOT/etc/pam.d/sudo-i
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%exclude %{_pkgdocdir}/ChangeLog
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%changelog
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* Mon Jan 30 2023 wangyu <wangyu283@huawei.com> - 1.9.2-10
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- Fix CVE-2023-22809.
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* Thu Dec 08 2022 wangyu <wangyu283@huawei.com> - 1.9.2-9
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- Backport patches from upstream community
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