File sudo-CVE-2023-22809.patch of Package sudo

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File sudo-CVE-2023-22809.patch of Package sudo (Revision 3672836dec26f65d454402303e3d868b)

Currently displaying revision 3672836dec26f65d454402303e3d868b , Show latest

diff --git a/plugins/sudoers/editor.c b/plugins/sudoers/editor.c
index ec8e7b0..bee9bc1 100644
--- a/plugins/sudoers/editor.c
+++ b/plugins/sudoers/editor.c
@@ -54,7 +54,7 @@ resolve_editor(const char *ed, size_t edlen, int nfiles, char **files,
     const char *cp, *ep, *tmp;
     const char *edend = ed + edlen;
     struct stat user_editor_sb;
-    int nargc;
+    int nargc = 0;
     debug_decl(resolve_editor, SUDOERS_DEBUG_UTIL)
 
     /*
@@ -103,6 +103,21 @@ resolve_editor(const char *ed, size_t edlen, int nfiles, char **files,
 	    free(nargv);
 	    debug_return_str(NULL);
 	}
+
+	/*
+	 * We use "--" to separate the editor and arguments from the files
+	 * to edit.  The editor arguments themselves may not contain "--".
+	 */
+	if (strcmp(nargv[nargc], "--") == 0) {
+	  sudo_warnx(U_("ignoring editor: %.*s"), (int)edlen, ed);
+	  sudo_warnx("%s", U_("editor arguments may not contain \"--\""));
+	  errno = EINVAL;
+	  free(editor_path);
+	  while (nargc--)
+	    free(nargv[nargc]);
+	  free(nargv);
+	  debug_return_str(NULL);
+	}
     }
     if (nfiles != 0) {
 	nargv[nargc++] = "--";
diff --git a/plugins/sudoers/sudoers.c b/plugins/sudoers/sudoers.c
index 5f10653..c702878 100644
--- a/plugins/sudoers/sudoers.c
+++ b/plugins/sudoers/sudoers.c
@@ -588,19 +588,29 @@ sudoers_policy_main(int argc, char * const argv[], int pwflag, char *env_add[],
     /* Note: must call audit before uid change. */
     if (ISSET(sudo_mode, MODE_EDIT)) {
 	int edit_argc;
-	const char *env_editor;
+	const char *env_editor = NULL;
 
 	free(safe_cmnd);
 	safe_cmnd = find_editor(NewArgc - 1, NewArgv + 1, &edit_argc,
 	    &edit_argv, NULL, &env_editor, false);
 	if (safe_cmnd == NULL) {
-	    if (errno != ENOENT)
-		goto done;
+	  switch (errno) {
+	  case ENOENT:
 	    audit_failure(NewArgc, NewArgv, N_("%s: command not found"),
-		env_editor ? env_editor : def_editor);
+			  env_editor ? env_editor : def_editor);
 	    sudo_warnx(U_("%s: command not found"),
-		env_editor ? env_editor : def_editor);
+		       env_editor ? env_editor : def_editor);
 	    goto bad;
+	  case EINVAL:
+	    if (def_env_editor && env_editor != NULL) {
+	      /* User tried to do something funny with the editor. */
+	      log_warningx(SLOG_NO_STDERR|SLOG_SEND_MAIL,
+			   "invalid user-specified editor: %s", env_editor);
+	      goto bad;
+	    }
+	  default:
+	    goto done;
+	  }
 	}
 	if (audit_success(edit_argc, edit_argv) != 0 && !def_ignore_audit_errors)
 	    goto done;
diff --git a/plugins/sudoers/visudo.c b/plugins/sudoers/visudo.c
index 50dda59..00cfe53 100644
--- a/plugins/sudoers/visudo.c
+++ b/plugins/sudoers/visudo.c
@@ -306,7 +306,7 @@ static char *
 get_editor(int *editor_argc, char ***editor_argv)
 {
     char *editor_path = NULL, **whitelist = NULL;
-    const char *env_editor;
+    const char *env_editor = NULL;
     static char *files[] = { "+1", "sudoers" };
     unsigned int whitelist_len = 0;
     debug_decl(get_editor, SUDOERS_DEBUG_UTIL)
@@ -340,7 +340,11 @@ get_editor(int *editor_argc, char ***editor_argv)
     if (editor_path == NULL) {
 	if (def_env_editor && env_editor != NULL) {
 	    /* We are honoring $EDITOR so this is a fatal error. */
-	    sudo_fatalx(U_("specified editor (%s) doesn't exist"), env_editor);
+	    if (errno == ENOENT) {
+		sudo_warnx(U_("specified editor (%s) doesn't exist"),
+		    env_editor);
+	    }
+	    exit(EXIT_FAILURE);
 	}
 	sudo_fatalx(U_("no editor found (editor path = %s)"), def_editor);
     }

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File sudo-CVE-2023-22809.patch of Package sudo (Revision 3672836dec26f65d454402303e3d868b)

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