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Home  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). Confidence 2013 5% Off any SANS course Use Code: SecuriTeam_5 Hack In Paris La Nuit du Hack Subjects of Interest: Vulnerability Management SQL Injection Buffer Overflows Active Network Scanning Fuzzing Fuzzer Report Network Security Network Scanner Pen Testing Security Scanner	Sudo Format String Exploit 29 Jan. 2013    Summary sudo 1.8.0 - 1.8.3p1 is prone to a format string vulnerability.   Credit: The information has been provided by joernchen. Free Website Security Scan Free Fuzzer Report Vulnerability Assessment Detect web app vulnerabilities University study comparing the top Accurate and automated scanning Get guidance from professionals. 6 commercially availble fuzzers. for networks of any size.    Details Protect your website! Free Trial, Nothing to install. No interruption of visitors. www.beyondsecurity.com/vulnerability-scanner Vulnerable Systems:  * sudo 1.8.0 - 1.8.3p1 Observe src/sudo.c: void sudo_debug(int level, const char *fmt, ...) { va_list ap; char *fmt2; if (level > debug_level) return; /* Backet fmt with program name and a newline to make it a single write */ easprintf(&fmt2, "%s: %s\n", getprogname(), fmt); va_start(ap, fmt); vfprintf(stderr, fmt2, ap); va_end(ap); efree(fmt2); } Here getprogname() is argv[0] and by this user controlled. So argv[0] goes to fmt2 which then gets vfprintf()ed to stderr. The result is a Format String vulnerability. [ Example ] /tmp $ ln -s /usr/bin/sudo %n /tmp $ ./%n -D9 *** %n in writable segment detected *** Aborted /tmp $ A note regarding exploitability: The above example shows the result of FORTIFY_SOURCE which makes explotitation painful but not impossible (see [0]). Without FORTIFY_SOURCE the exploit is straight forward: 1. Use formatstring to overwrite the setuid() call with setgid() 2. Trigger with formatstring -D9 3. Make use of SUDO_ASKPASS and have shellcode in askpass script 4. As askpass will be called after the formatstring has overwritten setuid() the askepass script will run with uid 0 5. Enjoy the rootshell CVE Information: 2012-0809 Disclosure Timeline: 2012-01-24 Send vulnerability details to sudo maintainer 2012-01-24 Maintainer is embarrased 2012-01-27 Asking maintainer how the fixing goes 2012-01-27 Maintainer responds with a patch and a release date of 2012-01-30 for the patched sudo and advisory 2012-01-30 Release of this advisory  Comments: blog comments powered by Disqus	All Sections Security News Unix focus Exploits Tools Windows focus Security Reviews  Related Articles SimplyPlay v.66 .pls File Buffer Overflow Exploit NProtect Anti-Virus Privilege Escalation Vulnerability Ripe HD FLV Player Plugin for WordPress Multiple Script Direct Request Path Disclosure Vulnerability CMS snews SQL Injection Vulnerability WeBid SQL Injection Exploit Invision Gallery SQL Injection Exploit ArrowChat External.php Lang Parameter Traversal Local File Inclusion Exploit WinWebMail Server Stored XSS Exploit TFTP Server for Windows ST WRQ Buffer Overflow Exploit QNX QCONN Remote Command Execution Exploit Distinct TFTP Writable Directory Traversal Execution Exploit Xion Audio Player 1.0.127 (.aiff) Denial of Service Exploit Wordpress Postie Plugin Stored XSS Exploit Vice City Multiplayer Server Remote Code Execution Exploit Sphpforum Multiple Exploits NetOp Remote Control Client Buffer Overflow Exploit MS12-005 Microsoft Office ClickOnce Unsafe Object Package Handling Exploit MaxForum Local File Inclusion Exploit Inferno vBShout SQL Injection Vulnerability WP Effective Lead Management Persistent XSS Exploit  Featured Articles Social Engine Multiple Exploits Novell Groupwise Address Book Remote Code Execution Exploit GWebmail XSS & LFI RCE Vulnerabilities Acpid Privilege Boundary Crossing Exploit McAfee Virtual Technician MVT.MVTControl.6300 ActiveX GetObject() Vulnerability 'SonicWall Global Management System XSS Vulnerability' 'Opera file:// Overflow' 'vxFtpSrv CWD Command Overflow' 'Kaminsky DNS Cache Poisoning Flaw Exploit for Domains' 'freeSSHD Post Authentication Buffer Overflow (Exploit)' 'Symantec Altiris Client Service Local Privilege Escalation (Exploit)' 'Apple Mac OS X SMB Vulnerabilities (mount_smbfs and smbutil)' 'SurgeMail Webmail Host Header DoS' 'PHP Win32std Extension safe_mode/disable_functions Protections Bypass' 'WinPcap NPF.SYS Privilege Elevation Vulnerability (PoC exploit)' 'MailEnable Buffer Overflow (LOGIN, Exploit)' 'Durian Web Application Server Buffer Overflow (Exploit)' 'KsIRC Buffer Overflow Exploit (PRIVMSG)' 'Allied Telesyn AT-TFTP Server Filename Buffer Overflow (Exploit)' 'Windows WorkStation NetpManageIPCConnect (MS06-070, Exploit)'
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