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import sudo-1.8.29-8.el8_7.1

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CentOS Sources 2023-01-23 03:23:39 -05:00 committed by Stepan Oksanichenko
parent 6c0248553e
commit e879763e7b
4 changed files with 365 additions and 1 deletions
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171
SOURCES/sudo-1.9.12-CVE-2023-22809-backports.patch Normal file
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@ -0,0 +1,171 @@
diff -up ./plugins/sudoers/editor.c.other ./plugins/sudoers/editor.c
--- ./plugins/sudoers/editor.c.other 2023-01-16 17:37:04.659967300 +0100
+++ ./plugins/sudoers/editor.c 2023-01-16 17:40:35.944400376 +0100
@@ -39,6 +39,82 @@
#include "sudoers.h"
/*
+ * Non-destructive word-split that handles single and double quotes and
+ * escaped white space. Quotes are only recognized at the start of a word.
+ * They are treated as normal characters inside a word.
+ */
+static const char *
+wordsplit(const char *str, const char *endstr, const char **last)
+{
+ const char *cp;
+ debug_decl(wordsplit, SUDO_DEBUG_UTIL);
+
+ /* If no str specified, use last ptr (if any). */
+ if (str == NULL) {
+ str = *last;
+ /* Consume end quote if present. */
+ if (*str == '"' || *str == '\'')
+ str++;
+ }
+
+ /* Skip leading white space characters. */
+ while (str < endstr && (*str == ' ' || *str == '\t'))
+ str++;
+
+ /* Empty string? */
+ if (str >= endstr) {
+ *last = endstr;
+ debug_return_ptr(NULL);
+ }
+
+ /* If word is quoted, skip to end quote and return. */
+ if (*str == '"' || *str == '\'') {
+ const char *endquote = memchr(str + 1, *str, endstr - str);
+ if (endquote != NULL) {
+ *last = endquote;
+ debug_return_const_ptr(str + 1);
+ }
+ }
+
+ /* Scan str until we encounter white space. */
+ for (cp = str; cp < endstr; cp++) {
+ if (*cp == '\\') {
+ /* quoted char, do not interpret */
+ cp++;
+ continue;
+ }
+ if (*cp == ' ' || *cp == '\t') {
+ /* end of word */
+ break;
+ }
+ }
+ *last = cp;
+ debug_return_const_ptr(str);
+}
+
+/* Copy len chars from string, collapsing chars escaped with a backslash. */
+static char *
+copy_arg(const char *src, size_t len)
+{
+ const char *src_end = src + len;
+ char *copy, *dst;
+ debug_decl(copy_arg, SUDOERS_DEBUG_UTIL);
+
+ if ((copy = malloc(len + 1)) != NULL) {
+ for (dst = copy; src < src_end; ) {
+ if (*src == '\\') {
+ src++;
+ continue;
+ }
+ *dst++ = *src++;
+ }
+ *dst = '\0';
+ }
+
+ debug_return_ptr(copy);
+}
+
+/*
* Search for the specified editor in the user's PATH, checking
* the result against allowlist if non-NULL. An argument vector
* suitable for execve() is allocated and stored in argv_out.
@@ -52,7 +128,7 @@ static char *
resolve_editor(const char *ed, size_t edlen, int nfiles, char **files,
int *argc_out, char ***argv_out, char * const *allowlist)
{
- char **nargv, *editor, *editor_path = NULL;
+ char **nargv = NULL, *editor = NULL, *editor_path = NULL;
const char *cp, *ep, *tmp;
const char *edend = ed + edlen;
struct stat user_editor_sb;
@@ -64,14 +140,12 @@ resolve_editor(const char *ed, size_t ed
* The EDITOR and VISUAL environment variables may contain command
* line args so look for those and alloc space for them too.
*/
- cp = sudo_strsplit(ed, edend, " \t", &ep);
+ cp = wordsplit(ed, edend, &ep);
if (cp == NULL)
debug_return_str(NULL);
- editor = strndup(cp, (size_t)(ep - cp));
- if (editor == NULL) {
- sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
- debug_return_str(NULL);
- }
+ editor = copy_arg(cp, ep - cp);
+ if (editor == NULL)
+ goto oom;
/* If we can't find the editor in the user's PATH, give up. */
if (find_path(editor, &editor_path, &user_editor_sb, getenv("PATH"), 0, allowlist) != FOUND) {
@@ -81,30 +155,22 @@ resolve_editor(const char *ed, size_t ed
}
/* Count rest of arguments and allocate editor argv. */
- for (nargc = 1, tmp = ep; sudo_strsplit(NULL, edend, " \t", &tmp) != NULL; )
+ for (nargc = 1, tmp = ep; wordsplit(NULL, edend, &tmp) != NULL; )
nargc++;
if (nfiles != 0)
nargc += nfiles + 1;
nargv = reallocarray(NULL, nargc + 1, sizeof(char *));
- if (nargv == NULL) {
- sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
- free(editor);
- free(editor_path);
- debug_return_str(NULL);
- }
+ if (nargv == NULL)
+ goto oom;
/* Fill in editor argv (assumes files[] is NULL-terminated). */
nargv[0] = editor;
- for (nargc = 1; (cp = sudo_strsplit(NULL, edend, " \t", &ep)) != NULL; nargc++) {
- nargv[nargc] = strndup(cp, (size_t)(ep - cp));
- if (nargv[nargc] == NULL) {
- sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
- free(editor_path);
- while (nargc--)
- free(nargv[nargc]);
- free(nargv);
- debug_return_str(NULL);
- }
+ editor = NULL;
+ for (nargc = 1; (cp = wordsplit(NULL, edend, &ep)) != NULL; nargc++) {
+ /* Copy string, collapsing chars escaped with a backslash. */
+ nargv[nargc] = copy_arg(cp, ep - cp);
+ if (nargv[nargc] == NULL)
+ goto oom;
}
if (nfiles != 0) {
nargv[nargc++] = "--";
@@ -116,6 +182,16 @@ resolve_editor(const char *ed, size_t ed
*argc_out = nargc;
*argv_out = nargv;
debug_return_str(editor_path);
+oom:
+ sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+ free(editor);
+ free(editor_path);
+ if (nargv != NULL) {
+ while (nargc--)
+ free(nargv[nargc]);
+ free(nargv);
+ }
+ debug_return_str(NULL);
}
/*

57
SOURCES/sudo-1.9.12-CVE-2023-22809-whitelist.patch Normal file
View File

@ -0,0 +1,57 @@
diff -up ./plugins/sudoers/editor.c.whitelist ./plugins/sudoers/editor.c
--- ./plugins/sudoers/editor.c.whitelist 2023-01-16 17:31:58.108335076 +0100
+++ ./plugins/sudoers/editor.c 2023-01-16 17:33:37.375547672 +0100
@@ -40,7 +40,7 @@
/*
* Search for the specified editor in the user's PATH, checking
- * the result against whitelist if non-NULL. An argument vector
+ * the result against allowlist if non-NULL. An argument vector
* suitable for execve() is allocated and stored in argv_out.
* If nfiles is non-zero, files[] is added to the end of argv_out.
*
@@ -50,7 +50,7 @@
*/
static char *
resolve_editor(const char *ed, size_t edlen, int nfiles, char **files,
- int *argc_out, char ***argv_out, char * const *whitelist)
+ int *argc_out, char ***argv_out, char * const *allowlist)
{
char **nargv, *editor, *editor_path = NULL;
const char *cp, *ep, *tmp;
@@ -74,7 +74,7 @@ resolve_editor(const char *ed, size_t ed
}
/* If we can't find the editor in the user's PATH, give up. */
- if (find_path(editor, &editor_path, &user_editor_sb, getenv("PATH"), 0, whitelist) != FOUND) {
+ if (find_path(editor, &editor_path, &user_editor_sb, getenv("PATH"), 0, allowlist) != FOUND) {
free(editor);
errno = ENOENT;
debug_return_str(NULL);
@@ -130,7 +130,7 @@ resolve_editor(const char *ed, size_t ed
*/
char *
find_editor(int nfiles, char **files, int *argc_out, char ***argv_out,
- char * const *whitelist, const char **env_editor, bool env_error)
+ char * const *allowlist, const char **env_editor, bool env_error)
{
char *ev[3], *editor_path = NULL;
unsigned int i;
@@ -149,7 +149,7 @@ find_editor(int nfiles, char **files, in
if (editor != NULL && *editor != '\0') {
*env_editor = editor;
editor_path = resolve_editor(editor, strlen(editor),
- nfiles, files, argc_out, argv_out, whitelist);
+ nfiles, files, argc_out, argv_out, allowlist);
if (editor_path != NULL)
break;
if (errno != ENOENT)
@@ -169,7 +169,7 @@ find_editor(int nfiles, char **files, in
for (cp = sudo_strsplit(def_editor, def_editor_end, ":", &ep);
cp != NULL; cp = sudo_strsplit(NULL, def_editor_end, ":", &ep)) {
editor_path = resolve_editor(cp, (size_t)(ep - cp), nfiles,
- files, argc_out, argv_out, whitelist);
+ files, argc_out, argv_out, allowlist);
if (editor_path != NULL)
break;
if (errno != ENOENT)

122
SOURCES/sudo-1.9.12-CVE-2023-22809.patch Normal file
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@ -0,0 +1,122 @@
diff -up ./plugins/sudoers/editor.c.cve ./plugins/sudoers/editor.c
--- ./plugins/sudoers/editor.c.cve 2023-01-16 17:52:37.074066664 +0100
+++ ./plugins/sudoers/editor.c 2023-01-16 17:58:06.603774304 +0100
@@ -132,7 +132,7 @@ resolve_editor(const char *ed, size_t ed
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)
/*
@@ -149,9 +149,7 @@ resolve_editor(const char *ed, size_t ed
/* If we can't find the editor in the user's PATH, give up. */
if (find_path(editor, &editor_path, &user_editor_sb, getenv("PATH"), 0, allowlist) != FOUND) {
- free(editor);
- errno = ENOENT;
- debug_return_str(NULL);
+ goto bad;
}
/* Count rest of arguments and allocate editor argv. */
@@ -171,7 +169,19 @@ resolve_editor(const char *ed, size_t ed
nargv[nargc] = copy_arg(cp, ep - cp);
if (nargv[nargc] == NULL)
goto oom;
+
+ /*
+ * 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;
+ goto bad;
+ }
}
+
if (nfiles != 0) {
nargv[nargc++] = "--";
while (nfiles--)
@@ -184,6 +194,7 @@ resolve_editor(const char *ed, size_t ed
debug_return_str(editor_path);
oom:
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+bad:
free(editor);
free(editor_path);
if (nargv != NULL) {
diff -up ./plugins/sudoers/sudoers.c.cve ./plugins/sudoers/sudoers.c
--- ./plugins/sudoers/sudoers.c.cve 2023-01-16 17:52:37.074066664 +0100
+++ ./plugins/sudoers/sudoers.c 2023-01-16 18:02:43.928307505 +0100
@@ -634,21 +634,32 @@ sudoers_policy_main(int argc, char * con
/* 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;
+ int edit_argc;
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;
- audit_failure(NewArgc, NewArgv, N_("%s: command not found"),
- env_editor ? env_editor : def_editor);
- sudo_warnx(U_("%s: command not found"),
- env_editor ? env_editor : def_editor);
- goto bad;
- }
+ switch (errno) {
+ case ENOENT:
+ audit_failure(NewArgc, NewArgv, N_("%s: command not found"),
+ env_editor ? env_editor : def_editor);
+ sudo_warnx(U_("%s: command not found"),
+ 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 -up ./plugins/sudoers/visudo.c.cve ./plugins/sudoers/visudo.c
--- ./plugins/sudoers/visudo.c.cve 2019-10-28 13:28:54.000000000 +0100
+++ ./plugins/sudoers/visudo.c 2023-01-16 18:03:48.713975354 +0100
@@ -308,7 +308,7 @@ 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)
@@ -342,7 +342,11 @@ get_editor(int *editor_argc, char ***edi
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);
}

16
SPECS/sudo.spec
View File

@ -1,7 +1,7 @@
Summary: Allows restricted root access for specified users
Name: sudo
Version: 1.8.29
Release: 8%{?dist}
Release: 8%{?dist}.1
License: ISC
Group: Applications/System
URL: https://www.sudo.ws/
@ -76,6 +76,11 @@ Patch21: sudo-1.9.7-krb5ccname.patch
# 1986572 - utmp resource leak in sudo
Patch22: sudo-1.9.7-utmp-leak.patch
# 2161220 - EMBARGOED CVE-2023-22809 sudo: arbitrary file write with privileges of the RunAs user [rhel-8.7.0]
Patch24: sudo-1.9.12-CVE-2023-22809-whitelist.patch
Patch25: sudo-1.9.12-CVE-2023-22809-backports.patch
Patch26: sudo-1.9.12-CVE-2023-22809.patch
%description
Sudo (superuser do) allows a system administrator to give certain
users (or groups of users) the ability to run some (or all) commands
@ -128,6 +133,10 @@ plugins that use %{name}.
%patch21 -p1 -b .krb5ccname
%patch22 -p1 -b .utmp-leak
%patch24 -p1 -b .whitelist
%patch25 -p1 -b .backports
%patch26 -p1 -b .cve
%build
# Remove bundled copy of zlib
rm -rf zlib/
@ -286,6 +295,11 @@ rm -rf $RPM_BUILD_ROOT
%{_mandir}/man8/sudo_plugin.8*
%changelog
* Wed Jan 11 2023 Radovan Sroka <rsroka@redhat.com> - 1.8.29.8.1
RHEL 8.7.0.Z ERRATUM
- CVE-2023-22809 sudo: arbitrary file write with privileges of the RunAs user
Resolves: rhbz#2161220
* Mon Dec 06 2021 Radovan Sroka <rsroka@redhat.com> - 1.8.29-8
RHEL 8.6.0 ERRATUM
- sudoedit does not work with selinux args