!62 fix CVE-2024-58250
From: @eaglegai Reviewed-by: @xiangyu2020 Signed-off-by: @xiangyu2020
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190
backport-CVE-2024-58250.patch
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190
backport-CVE-2024-58250.patch
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From 0a66ad22e54c72690ec2a29a019767c55c5281fc Mon Sep 17 00:00:00 2001
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From: Paul Mackerras <paulus@ozlabs.org>
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Date: Fri, 18 Oct 2024 20:22:57 +1100
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Subject: [PATCH] pppd: Remove passprompt plugin
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This is prompted by a number of factors:
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* It was more useful back in the dial-up days, but no-one uses dial-up
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any more
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* In many cases there will be no terminal accessible to the prompter
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program at the point where the prompter is run
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* The passwordfd plugin does much the same thing but does it more
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cleanly and securely
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* The handling of privileges and file descriptors needs to be audited
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thoroughly.
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Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
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---
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pppd/plugins/Makefile.am | 6 +-
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pppd/plugins/passprompt.c | 137 --------------------------------------
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2 files changed, 1 insertion(+), 142 deletions(-)
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delete mode 100644 pppd/plugins/passprompt.c
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diff --git a/pppd/plugins/Makefile.am b/pppd/plugins/Makefile.am
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index 2826148c7..9480d51b4 100644
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--- a/pppd/plugins/Makefile.am
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+++ b/pppd/plugins/Makefile.am
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@@ -1,4 +1,4 @@
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-pppd_plugin_LTLIBRARIES = minconn.la passprompt.la passwordfd.la winbind.la
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+pppd_plugin_LTLIBRARIES = minconn.la passwordfd.la winbind.la
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pppd_plugindir = $(PPPD_PLUGIN_DIR)
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PLUGIN_CPPFLAGS = -I${top_srcdir}
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@@ -8,10 +8,6 @@ minconn_la_CPPFLAGS = $(PLUGIN_CPPFLAGS)
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minconn_la_LDFLAGS = $(PLUGIN_LDFLAGS)
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minconn_la_SOURCES = minconn.c
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-passprompt_la_CPPFLAGS = $(PLUGIN_CPPFLAGS)
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-passprompt_la_LDFLAGS = $(PLUGIN_LDFLAGS)
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-passprompt_la_SOURCES = passprompt.c
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-
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passwordfd_la_CPPFLAGS = $(PLUGIN_CPPFLAGS)
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passwordfd_la_LDFLAGS = $(PLUGIN_LDFLAGS)
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passwordfd_la_SOURCES = passwordfd.c
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diff --git a/pppd/plugins/passprompt.c b/pppd/plugins/passprompt.c
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deleted file mode 100644
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index 7779d511d..000000000
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--- a/pppd/plugins/passprompt.c
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+++ /dev/null
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@@ -1,137 +0,0 @@
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-/*
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- * passprompt.c - pppd plugin to invoke an external PAP password prompter
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- *
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- * Copyright 1999 Paul Mackerras, Alan Curry.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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- */
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-
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-#include <errno.h>
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-#include <unistd.h>
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-#include <sys/wait.h>
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-#include <sys/param.h>
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-#include <limits.h>
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-#include <stdio.h>
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-#include <syslog.h>
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-#include <stdarg.h>
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-#include <stdint.h>
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-#include <stdbool.h>
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-#include <string.h>
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-
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-#include <pppd/pppd.h>
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-#include <pppd/upap.h>
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-#include <pppd/eap.h>
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-#include <pppd/options.h>
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-
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-char pppd_version[] = PPPD_VERSION;
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-
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-static char promptprog[PATH_MAX+1];
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-static int promptprog_refused = 0;
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-
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-static struct option options[] = {
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- { "promptprog", o_string, promptprog,
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- "External PAP password prompting program",
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- OPT_STATIC, NULL, PATH_MAX },
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- { NULL }
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-};
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-
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-static int promptpass(char *user, char *passwd)
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-{
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- int p[2];
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- pid_t kid;
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- int readgood, wstat, ret;
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- ssize_t red;
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-
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- if (promptprog_refused || promptprog[0] == 0 || access(promptprog, X_OK) < 0)
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- return -1; /* sorry, can't help */
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-
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- if (!passwd)
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- return 1;
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-
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- if (pipe(p)) {
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- warn("Can't make a pipe for %s", promptprog);
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- return 0;
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- }
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- if ((kid = fork()) == (pid_t) -1) {
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- warn("Can't fork to run %s", promptprog);
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- close(p[0]);
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- close(p[1]);
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- return 0;
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- }
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- if (!kid) {
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- /* we are the child, exec the program */
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- char *argv[5], fdstr[32];
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- ppp_sys_close();
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- closelog();
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- close(p[0]);
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- ret = seteuid(getuid());
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- if (ret != 0) {
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- warn("Couldn't set effective user id");
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- }
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- ret = setegid(getgid());
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- if (ret != 0) {
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- warn("Couldn't set effective user id");
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- }
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- sprintf(fdstr, "%d", p[1]);
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- argv[0] = promptprog;
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- argv[1] = strdup(user);
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- argv[2] = strdup(ppp_remote_name());
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- argv[3] = fdstr;
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- argv[4] = 0;
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- execv(*argv, argv);
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- _exit(127);
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- }
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-
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- /* we are the parent, read the password from the pipe */
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- close(p[1]);
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- readgood = 0;
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- do {
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- red = read(p[0], passwd + readgood, MAXSECRETLEN-1 - readgood);
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- if (red == 0)
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- break;
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- if (red < 0) {
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- if (errno == EINTR && !ppp_signaled(SIGTERM))
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- continue;
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- error("Can't read secret from %s: %m", promptprog);
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- readgood = -1;
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- break;
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- }
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- readgood += red;
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- } while (readgood < MAXSECRETLEN - 1);
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- close(p[0]);
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-
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- /* now wait for child to exit */
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- while (waitpid(kid, &wstat, 0) < 0) {
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- if (errno != EINTR || ppp_signaled(SIGTERM)) {
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- warn("error waiting for %s: %m", promptprog);
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- break;
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- }
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- }
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-
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- if (readgood < 0)
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- return 0;
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- passwd[readgood] = 0;
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- if (!WIFEXITED(wstat))
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- warn("%s terminated abnormally", promptprog);
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- if (WEXITSTATUS(wstat)) {
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- warn("%s exited with code %d", promptprog, WEXITSTATUS(wstat));
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- /* code when cancel was hit in the prompt prog */
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- if (WEXITSTATUS(wstat) == 128) {
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- promptprog_refused = 1;
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- }
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- return -1;
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- }
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- return 1;
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-}
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-
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-void plugin_init(void)
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-{
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- ppp_add_options(options);
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- pap_passwd_hook = promptpass;
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-#ifdef PPP_WITH_EAPTLS
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- eaptls_passwd_hook = promptpass;
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-#endif
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-}
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9
ppp.spec
9
ppp.spec
@ -1,6 +1,6 @@
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Name: ppp
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Version: 2.5.0
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Release: 4
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Release: 5
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Summary: The Point-to-Point Protocol
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License: BSD and LGPLv2+ and GPLv2+ and Public Domain
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@ -38,6 +38,7 @@ Patch0009: refuse-pap-by-default-for-security.patch
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Patch0010: backport-Fixing-up-parsing-in-radiusclient.conf.patch
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Patch0011: backport-Add-configure-check-to-see-if-we-have-struct-sockaddr_ll.patch
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Patch0012: backport-CVE-2024-58250.patch
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%description
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The Point-to-Point Protocol (PPP) provides a standard way to establish
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@ -141,6 +142,12 @@ mkdir -p %{buildroot}%{_rundir}/pppd/lock
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%{_mandir}/man8/*.8.gz
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%changelog
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* Tue Apr 29 2025 gaihuiying <eaglegai@163.com> - 2.5.0-5
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- Type:CVE
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- CVE:CVE-2024-58250
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- SUG:NA
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- DESC:fix CVE-2024-58250
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* Fri Feb 14 2025 gaihuiying <eaglegai@163.com> - 2.5.0-4
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- Type:bugfix
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- CVE:NA
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