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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	Remote Overflow in tHTTPd (< > replacing) 28 Oct. 2003    Summary A vulneability in tHTTPd allows remote attackers to overflow an internal buffer and partially overwrite EBP register and execute arbitrary code.   Credit: The information has been provided by texonet.com. 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:  * tHTTPd version 2.21 up to version 2.23b1 Immune systems:  * tHTTPd version 2.24 The problem is found in libhttpd.c in the function defang() static void defang( char* str, char* dfstr, int dfsize )     {     char* cp1;     char* cp2;     for ( cp1 = str, cp2 = dfstr;    *cp1 != '\0' && cp2 - dfstr < dfsize - 1;    ++cp1, ++cp2 )  {  switch ( *cp1 )      {      case '<':      *cp2++ = '&';      *cp2++ = 'l';      *cp2++ = 't';      *cp2 = ';';      break;      case '>':      *cp2++ = '&';      *cp2++ = 'g';      *cp2++ = 't';      *cp2 = ';';      break;      default:      *cp2 = *cp1;      break;      }  }     *cp2 = '\0';     } So when '<' or '>' are found in the input we "pay for 1 and get 3 for free", this allows us overwrite bits of EBP and indirectly control EIP (assuming its been compiled with gcc < 3.0). Workaround: Upgrade to version 2.24 Disclosure Timeline: 09/08/2003: Vendor notified by e-mail 09/12/2003: Vendor replies with working fix 10/27/2003: Public release  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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