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SUSE:SLE-15-SP1:GA
sudo
sudo-CVE-2021-3156.patch
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File sudo-CVE-2021-3156.patch of Package sudo
# HG changeset patch # Parent 2dbbab94d4b60ae05cb2aebf5bad1b9e18cdbb11 Reset valid_flags to MODE_NONINTERACTIVE for sudoedit. This is consistent with how the -e option is handled. Also reject -H and -P flags for sudoedit as was done in sudo 1.7. Found by Qualys. diff --git a/plugins/sudoers/policy.c b/plugins/sudoers/policy.c index 09cf401..e2dd7c8 100644 --- a/plugins/sudoers/policy.c +++ b/plugins/sudoers/policy.c @@ -98,10 +98,11 @@ parse_bool(const char *line, int varlen, int *flags, int fval) int sudoers_policy_deserialize_info(void *v, char **runas_user, char **runas_group) { + const int edit_mask = MODE_EDIT|MODE_IGNORE_TICKET|MODE_NONINTERACTIVE; struct sudoers_policy_open_info *info = v; - char * const *cur; const char *p, *errstr, *groups = NULL; const char *remhost = NULL; + char * const *cur; bool uid_set = false, gid_set = false; int flags = 0; debug_decl(sudoers_policy_deserialize_info, SUDOERS_DEBUG_PLUGIN) @@ -331,6 +332,12 @@ sudoers_policy_deserialize_info(void *v, char **runas_user, char **runas_group) #endif } + /* Sudo front-end should restrict mode flags for sudoedit. */ + if (ISSET(flags, MODE_EDIT) && (flags & edit_mask) != flags) { + sudo_warnx(U_("invalid mode flags from sudo front end: 0x%x"), flags); + goto bad; + } + user_umask = (mode_t)-1; for (cur = info->user_info; *cur != NULL; cur++) { if (MATCHES(*cur, "user=")) { diff --git a/plugins/sudoers/sudoers.c b/plugins/sudoers/sudoers.c index 1267949..5f10653 100644 --- a/plugins/sudoers/sudoers.c +++ b/plugins/sudoers/sudoers.c @@ -404,7 +404,7 @@ sudoers_policy_main(int argc, char * const argv[], int pwflag, char *env_add[], /* If run as root with SUDO_USER set, set sudo_user.pw to that user. */ /* XXX - causes confusion when root is not listed in sudoers */ - if (sudo_mode & (MODE_RUN | MODE_EDIT) && prev_user != NULL) { + if (ISSET(sudo_mode, MODE_RUN|MODE_EDIT) && prev_user != NULL) { if (user_uid == 0 && strcmp(prev_user, "root") != 0) { struct passwd *pw; @@ -784,8 +784,8 @@ set_cmnd(void) if (user_cmnd == NULL) user_cmnd = NewArgv[0]; - if (sudo_mode & (MODE_RUN | MODE_EDIT | MODE_CHECK)) { - if (ISSET(sudo_mode, MODE_RUN | MODE_CHECK)) { + if (ISSET(sudo_mode, MODE_RUN|MODE_EDIT|MODE_CHECK)) { + if (!ISSET(sudo_mode, MODE_EDIT)) { if (def_secure_path && !user_is_exempt()) path = def_secure_path; if (!set_perms(PERM_RUNAS)) @@ -823,7 +823,8 @@ set_cmnd(void) sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory")); debug_return_int(-1); } - if (ISSET(sudo_mode, MODE_SHELL|MODE_LOGIN_SHELL)) { + if (ISSET(sudo_mode, MODE_SHELL|MODE_LOGIN_SHELL) && + ISSET(sudo_mode, MODE_RUN)) { /* * When running a command via a shell, the sudo front-end * escapes potential meta chars. We unescape non-spaces @@ -831,10 +832,22 @@ set_cmnd(void) */ for (to = user_args, av = NewArgv + 1; (from = *av); av++) { while (*from) { - if (from[0] == '\\' && !isspace((unsigned char)from[1])) + if (from[0] == '\\' && from[1] != '\0' && + !isspace((unsigned char)from[1])) { from++; + } + if (size - (to - user_args) < 1) { + sudo_warnx(U_("internal error, %s overflow"), + __func__); + debug_return_int(NOT_FOUND_ERROR); + } *to++ = *from++; } + if (size - (to - user_args) < 1) { + sudo_warnx(U_("internal error, %s overflow"), + __func__); + debug_return_int(NOT_FOUND_ERROR); + } *to++ = ' '; } *--to = '\0'; diff --git a/plugins/sudoers/timestamp.c b/plugins/sudoers/timestamp.c index 5930103..ea81c3e 100644 --- a/plugins/sudoers/timestamp.c +++ b/plugins/sudoers/timestamp.c @@ -650,8 +650,8 @@ timestamp_lock(void *vcookie, struct passwd *pw) } else if (entry.type != TS_LOCKEXCL) { /* Old sudo record, convert it to TS_LOCKEXCL. */ entry.type = TS_LOCKEXCL; - memset((char *)&entry + offsetof(struct timestamp_entry, type), 0, - nread - offsetof(struct timestamp_entry, type)); + memset((char *)&entry + offsetof(struct timestamp_entry, flags), 0, + nread - offsetof(struct timestamp_entry, flags)); if (ts_write(cookie->fd, cookie->fname, &entry, 0) == -1) debug_return_bool(false); } diff --git a/src/parse_args.c b/src/parse_args.c index d9bbe06..5250f23 100644 --- a/src/parse_args.c +++ b/src/parse_args.c @@ -122,6 +122,9 @@ struct environment { * Default flags allowed when running a command. */ #define DEFAULT_VALID_FLAGS (MODE_BACKGROUND|MODE_PRESERVE_ENV|MODE_RESET_HOME|MODE_LOGIN_SHELL|MODE_NONINTERACTIVE|MODE_SHELL) +#define EDIT_VALID_FLAGS MODE_NONINTERACTIVE +#define LIST_VALID_FLAGS (MODE_NONINTERACTIVE|MODE_LONG_LIST) +#define VALIDATE_VALID_FLAGS MODE_NONINTERACTIVE /* Option number for the --host long option due to ambiguity of the -h flag. */ #define OPT_HOSTNAME 256 @@ -265,6 +268,7 @@ parse_args(int argc, char **argv, int *nargc, char ***nargv, progname = "sudoedit"; mode = MODE_EDIT; sudo_settings[ARG_SUDOEDIT].value = "true"; + valid_flags = EDIT_VALID_FLAGS; } /* Load local IP addresses and masks. */ @@ -350,7 +354,7 @@ parse_args(int argc, char **argv, int *nargc, char ***nargv, usage_excl(1); mode = MODE_EDIT; sudo_settings[ARG_SUDOEDIT].value = "true"; - valid_flags = MODE_NONINTERACTIVE; + valid_flags = EDIT_VALID_FLAGS; break; case 'g': if (*optarg == '\0') @@ -360,6 +364,7 @@ parse_args(int argc, char **argv, int *nargc, char ***nargv, break; case 'H': sudo_settings[ARG_SET_HOME].value = "true"; + SET(flags, MODE_RESET_HOME); break; case 'h': if (optarg == NULL) { @@ -409,7 +414,7 @@ parse_args(int argc, char **argv, int *nargc, char ***nargv, usage_excl(1); } mode = MODE_LIST; - valid_flags = MODE_NONINTERACTIVE|MODE_LONG_LIST; + valid_flags = LIST_VALID_FLAGS; break; case 'n': SET(flags, MODE_NONINTERACTIVE); @@ -417,6 +422,7 @@ parse_args(int argc, char **argv, int *nargc, char ***nargv, break; case 'P': sudo_settings[ARG_PRESERVE_GROUPS].value = "true"; + SET(flags, MODE_PRESERVE_GROUPS); break; case 'p': /* An empty prompt is allowed. */ @@ -460,7 +466,7 @@ parse_args(int argc, char **argv, int *nargc, char ***nargv, if (mode && mode != MODE_VALIDATE) usage_excl(1); mode = MODE_VALIDATE; - valid_flags = MODE_NONINTERACTIVE; + valid_flags = VALIDATE_VALID_FLAGS; break; case 'V': if (mode && mode != MODE_VERSION) @@ -487,7 +493,7 @@ parse_args(int argc, char **argv, int *nargc, char ***nargv, if (!mode) { /* Defer -k mode setting until we know whether it is a flag or not */ if (sudo_settings[ARG_IGNORE_TICKET].value != NULL) { - if (argc == 0 && !(flags & (MODE_SHELL|MODE_LOGIN_SHELL))) { + if (argc == 0 && !ISSET(flags, MODE_SHELL|MODE_LOGIN_SHELL)) { mode = MODE_INVALIDATE; /* -k by itself */ sudo_settings[ARG_IGNORE_TICKET].value = NULL; valid_flags = 0; @@ -557,16 +563,16 @@ parse_args(int argc, char **argv, int *nargc, char ***nargv, if (argc != 0) { /* shell -c "command" */ char *src, *dst; - size_t cmnd_size = (size_t) (argv[argc - 1] - argv[0]) + - strlen(argv[argc - 1]) + 1; + size_t size = 0; - cmnd = dst = reallocarray(NULL, cmnd_size, 2); - if (cmnd == NULL) + for (av = argv; *av != NULL; av++) + size += strlen(*av) + 1; + if (size == 0 || (cmnd = reallocarray(NULL, size, 2)) == NULL) sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory")); if (!gc_add(GC_PTR, cmnd)) exit(1); - for (av = argv; *av != NULL; av++) { + for (dst = cmnd, av = argv; *av != NULL; av++) { for (src = *av; *src != '\0'; src++) { /* quote potential meta characters */ if (!isalnum((unsigned char)*src) && *src != '_' && *src != '-' && *src != '$')
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