diff --git a/SOURCES/sudo-1.9.17-CVE-2026-35535-1.patch b/SOURCES/sudo-1.9.17-CVE-2026-35535-1.patch new file mode 100644 index 0000000..cd83f2a --- /dev/null +++ b/SOURCES/sudo-1.9.17-CVE-2026-35535-1.patch @@ -0,0 +1,58 @@ +From fc252b5dd06cb0159fd31309bcffef410c724688 Mon Sep 17 00:00:00 2001 +From: "Todd C. Miller" +Date: Fri, 29 Jan 2021 05:42:34 -0700 +Subject: [PATCH] Fix NO_ROOT_MAILER, broken by the eventlog refactor in sudo + 1.9.4. init_eventlog_config() is called immediately after initializing the + Defaults settings, which is before struct sudo_user is setup. This adds a + call to eventlog_set_mailuid() if NO_ROOT_MAILER is defined after the + invoking user is determined. Reported by Roman Fiedler. + + (cherry picked from commit e5ad88488d57dd30a7f08f46b395bccfd3957293) +--- + plugins/sudoers/logging.c | 7 +------ + plugins/sudoers/policy.c | 4 ++++ + 2 files changed, 5 insertions(+), 6 deletions(-) + +diff --git a/plugins/sudoers/logging.c b/plugins/sudoers/logging.c +index 776f881e5..06efbf576 100644 +--- a/plugins/sudoers/logging.c ++++ b/plugins/sudoers/logging.c +@@ -786,11 +786,6 @@ void + init_eventlog_config(void) + { + int logtype = 0; +-#ifdef NO_ROOT_MAILER +- uid_t mailuid = user_uid; +-#else +- uid_t mailuid = ROOT_UID; +-#endif + debug_decl(init_eventlog_config, SUDOERS_DEBUG_LOGGING); + + if (def_syslog) +@@ -805,7 +800,7 @@ init_eventlog_config(void) + eventlog_set_syslog_alertpri(def_syslog_badpri); + eventlog_set_syslog_maxlen(def_syslog_maxlen); + eventlog_set_file_maxlen(def_loglinelen); +- eventlog_set_mailuid(mailuid); ++ eventlog_set_mailuid(ROOT_UID); + eventlog_set_omit_hostname(!def_log_host); + eventlog_set_logpath(def_logfile); + eventlog_set_time_fmt(def_log_year ? "%h %e %T %Y" : "%h %e %T"); +diff --git a/plugins/sudoers/policy.c b/plugins/sudoers/policy.c +index d675d2fd4..074c3f0e8 100644 +--- a/plugins/sudoers/policy.c ++++ b/plugins/sudoers/policy.c +@@ -518,6 +518,10 @@ sudoers_policy_deserialize_info(void *v) + /* Some systems support fexecve() which we use for digest matches. */ + cmnd_fd = -1; + ++#ifdef NO_ROOT_MAILER ++ eventlog_set_mailuid(user_uid); ++#endif ++ + /* Dump settings and user info (XXX - plugin args) */ + for (cur = info->settings; *cur != NULL; cur++) + sudo_debug_printf(SUDO_DEBUG_INFO, "settings: %s", *cur); +-- +2.53.0 + diff --git a/SOURCES/sudo-1.9.17-CVE-2026-35535-2.patch b/SOURCES/sudo-1.9.17-CVE-2026-35535-2.patch new file mode 100644 index 0000000..1b05625 --- /dev/null +++ b/SOURCES/sudo-1.9.17-CVE-2026-35535-2.patch @@ -0,0 +1,148 @@ +From 67448bdde671f298ad472e6af6ad4a380f9e3395 Mon Sep 17 00:00:00 2001 +From: "Todd C. Miller" +Date: Sat, 8 Nov 2025 15:34:02 -0700 +Subject: [PATCH] exec_mailer: Set group as well as uid when running the mailer + +Also make a setuid(), setgid() or setgroups() failure fatal. + +Found by the ZeroPath AI Security Engineer + +(cherry picked from commit 3e474c2f201484be83d994ae10a4e20e8c81bb69) +--- + include/sudo_eventlog.h | 3 ++- + lib/eventlog/eventlog.c | 21 +++++++++++++++++---- + lib/eventlog/eventlog_conf.c | 4 +++- + plugins/sudoers/logging.c | 2 +- + plugins/sudoers/policy.c | 2 +- + 5 files changed, 24 insertions(+), 8 deletions(-) + +diff --git a/include/sudo_eventlog.h b/include/sudo_eventlog.h +index 07ef9dcbe..cdf27f0e8 100644 +--- a/include/sudo_eventlog.h ++++ b/include/sudo_eventlog.h +@@ -78,6 +78,7 @@ struct eventlog_config { + int syslog_maxlen; + int file_maxlen; + uid_t mailuid; ++ gid_t mailgid; + bool omit_hostname; + const char *logpath; + const char *time_fmt; +@@ -136,7 +137,7 @@ void eventlog_set_syslog_rejectpri(int pri); + void eventlog_set_syslog_alertpri(int pri); + void eventlog_set_syslog_maxlen(int len); + void eventlog_set_file_maxlen(int len); +-void eventlog_set_mailuid(uid_t uid); ++void eventlog_set_mailuser(uid_t uid, gid_t gid); + void eventlog_set_omit_hostname(bool omit_hostname); + void eventlog_set_logpath(const char *path); + void eventlog_set_time_fmt(const char *fmt); +diff --git a/lib/eventlog/eventlog.c b/lib/eventlog/eventlog.c +index 0febe66c1..7d042a0ab 100644 +--- a/lib/eventlog/eventlog.c ++++ b/lib/eventlog/eventlog.c +@@ -280,15 +280,13 @@ exec_mailer(int pipein) + syslog(LOG_ERR, _("unable to dup stdin: %m")); // -V618 + sudo_debug_printf(SUDO_DEBUG_ERROR, + "unable to dup stdin: %s", strerror(errno)); +- sudo_debug_exit(__func__, __FILE__, __LINE__, sudo_debug_subsys); +- _exit(127); ++ goto bad; + } + + /* Build up an argv based on the mailer path and flags */ + if ((mflags = strdup(evl_conf->mailerflags)) == NULL) { + syslog(LOG_ERR, _("unable to allocate memory")); // -V618 +- sudo_debug_exit(__func__, __FILE__, __LINE__, sudo_debug_subsys); +- _exit(127); ++ goto bad; + } + if ((argv[0] = strrchr(mpath, '/'))) + argv[0]++; +@@ -310,11 +309,23 @@ exec_mailer(int pipein) + if (setuid(ROOT_UID) != 0) { + sudo_debug_printf(SUDO_DEBUG_ERROR, "unable to change uid to %u", + ROOT_UID); ++ goto bad; ++ } ++ if (setgid(evl_conf->mailgid) != 0) { ++ sudo_debug_printf(SUDO_DEBUG_ERROR, "unable to change gid to %u", ++ (unsigned int)evl_conf->mailgid); ++ goto bad; ++ } ++ if (setgroups(1, &evl_conf->mailgid) != 0) { ++ sudo_debug_printf(SUDO_DEBUG_ERROR, "unable to set groups to %u", ++ (unsigned int)evl_conf->mailgid); ++ goto bad; + } + if (evl_conf->mailuid != ROOT_UID) { + if (setuid(evl_conf->mailuid) != 0) { + sudo_debug_printf(SUDO_DEBUG_ERROR, "unable to change uid to %u", + (unsigned int)evl_conf->mailuid); ++ goto bad; + } + } + sudo_debug_exit(__func__, __FILE__, __LINE__, sudo_debug_subsys); +@@ -326,6 +335,9 @@ exec_mailer(int pipein) + sudo_debug_printf(SUDO_DEBUG_ERROR, "unable to execute %s: %s", + mpath, strerror(errno)); + _exit(127); ++bad: ++ sudo_debug_exit(__func__, __FILE__, __LINE__, sudo_debug_subsys); ++ _exit(127); + } + + /* Send a message to the mailto user */ +diff --git a/lib/eventlog/eventlog_conf.c b/lib/eventlog/eventlog_conf.c +index 8ad03851f..1c1d0a690 100644 +--- a/lib/eventlog/eventlog_conf.c ++++ b/lib/eventlog/eventlog_conf.c +@@ -70,6 +70,7 @@ static struct eventlog_config evl_conf = { + MAXSYSLOGLEN, /* syslog_maxlen */ + 0, /* file_maxlen */ + ROOT_UID, /* mailuid */ ++ ROOT_GID, /* mailgid */ + false, /* omit_hostname */ + _PATH_SUDO_LOGFILE, /* logpath */ + "%h %e %T", /* time_fmt */ +@@ -151,9 +152,10 @@ eventlog_set_file_maxlen(int len) + } + + void +-eventlog_set_mailuid(uid_t uid) ++eventlog_set_mailuser(uid_t uid, gid_t gid) + { + evl_conf.mailuid = uid; ++ evl_conf.mailgid = gid; + } + + void +diff --git a/plugins/sudoers/logging.c b/plugins/sudoers/logging.c +index 06efbf576..da03f3d96 100644 +--- a/plugins/sudoers/logging.c ++++ b/plugins/sudoers/logging.c +@@ -800,7 +800,7 @@ init_eventlog_config(void) + eventlog_set_syslog_alertpri(def_syslog_badpri); + eventlog_set_syslog_maxlen(def_syslog_maxlen); + eventlog_set_file_maxlen(def_loglinelen); +- eventlog_set_mailuid(ROOT_UID); ++ eventlog_set_mailuser(ROOT_UID, ROOT_GID); + eventlog_set_omit_hostname(!def_log_host); + eventlog_set_logpath(def_logfile); + eventlog_set_time_fmt(def_log_year ? "%h %e %T %Y" : "%h %e %T"); +diff --git a/plugins/sudoers/policy.c b/plugins/sudoers/policy.c +index 074c3f0e8..cb4c9bbdf 100644 +--- a/plugins/sudoers/policy.c ++++ b/plugins/sudoers/policy.c +@@ -519,7 +519,7 @@ sudoers_policy_deserialize_info(void *v) + cmnd_fd = -1; + + #ifdef NO_ROOT_MAILER +- eventlog_set_mailuid(user_uid); ++ eventlog_set_mailuser(user_uid, user_gid); + #endif + + /* Dump settings and user info (XXX - plugin args) */ +-- +2.53.0 + diff --git a/SPECS/sudo.spec b/SPECS/sudo.spec index edc33c1..7644542 100644 --- a/SPECS/sudo.spec +++ b/SPECS/sudo.spec @@ -1,7 +1,7 @@ Summary: Allows restricted root access for specified users Name: sudo Version: 1.9.5p2 -Release: 1%{?dist}.3 +Release: 1%{?dist}.5 License: ISC Group: Applications/System URL: https://www.sudo.ws/ @@ -59,6 +59,9 @@ Patch22: sudo-separator.patch Patch23: rebuild_env-Avoid-setting-SHELL-twice-for-sudo-i.patch +Patch24: sudo-1.9.17-CVE-2026-35535-1.patch +Patch25: sudo-1.9.17-CVE-2026-35535-2.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 @@ -106,6 +109,9 @@ plugins that use %{name}. %patch -P 21 -p1 -b .cmnd_no_wait %patch -P 22 -p1 -b .separator %patch -P 23 -p1 -b .double-shell +%patch -P 24 -p1 -b .cve-2026-35535-1 +%patch -P 25 -p1 -b .cve-2026-35535-2 + %build # Remove bundled copy of zlib @@ -281,6 +287,11 @@ rm -rf $RPM_BUILD_ROOT %{_mandir}/man8/sudo_plugin.8* %changelog +* Thu Apr 24 2026 Alejandro López - 1.9.5p2-1.5 +RHEL 8.10.0.Z ERRATUM +- CVE-2026-35535 - Privilege escalation due to failure in privilege drop calls +Resolves: RHEL-166060 + * Mon Nov 17 2025 Alejandro López - 1.9.5p2-1.3 RHEL 8.10.0.Z ERRATUM - sudo passes SHELL environment variable twice to the shell being executed [rhel-8]