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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	THTTPd 2.04 vulnerable to a remote stack overflow 16 Nov. 1999    Summary THTTPd (Trivial HTTP) is a simple, small, portable, fast, and supposedly secure (although otherwise was discovered) web server. This product has been discovered to contain an exploitable remote buffer overflow, which allows remote attackers to crash the HTTP server and possibly execute arbitrary code.   Credit: The vulnerability information has been discovered by: D. J. Bernstein. 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 2.04 and prior (as back as version 1.90a) Immune systems: THTTPd 2.05 and above. The THTTPd 2.04 code contains serious security vulnerability in the way it handles parsed HTTP If-Modified-Since fields. The parser only scans %[a-zA-Z] into a fixed-size stack buffer (without checking the size of the provided buffer). When THTTPd is fed an If-Modified-Since line with 1300 x's, it core dumps. This is something that any attacker on the Internet could do to any THTTPd server, taking down web service until THTTPd is restarted. A patch is provided below: *** tdate_parse.c     1999/09/15 16:09:36   1.1 --- tdate_parse.c     1999/11/10 01:16:39 *************** *** 211,217 ****     */     /* DD-mth-YY HH:MM:SS GMT */ !   if ( sscanf( cp, "%d-%[a-zA-Z]-%d %d:%d:%d GMT",            &tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,            &tm_sec ) == 6 &&         scan_mon( str_mon, &tm_mon ) ) --- 211,217 ----     */     /* DD-mth-YY HH:MM:SS GMT */ !   if ( sscanf( cp, "%d-%400[a-zA-Z]-%d %d:%d:%d GMT",            &tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,            &tm_sec ) == 6 &&         scan_mon( str_mon, &tm_mon ) ) *************** *** 225,231 ****      }     /* DD mth YY HH:MM:SS GMT */ !   else if ( sscanf( cp, "%d %[a-zA-Z] %d %d:%d:%d GMT",            &tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,            &tm_sec) == 6 &&         scan_mon( str_mon, &tm_mon ) ) --- 225,231 ----      }     /* DD mth YY HH:MM:SS GMT */ !   else if ( sscanf( cp, "%d %400[a-zA-Z] %d %d:%d:%d GMT",            &tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,            &tm_sec) == 6 &&         scan_mon( str_mon, &tm_mon ) ) *************** *** 239,245 ****      }     /* HH:MM:SS GMT DD-mth-YY */ !   else if ( sscanf( cp, "%d:%d:%d GMT %d-%[a-zA-Z]-%d",            &tm_hour, &tm_min, &tm_sec, &tm_mday, str_mon,            &tm_year ) == 6 &&         scan_mon( str_mon, &tm_mon ) ) --- 239,245 ----      }     /* HH:MM:SS GMT DD-mth-YY */ !   else if ( sscanf( cp, "%d:%d:%d GMT %d-%400[a-zA-Z]-%d",            &tm_hour, &tm_min, &tm_sec, &tm_mday, str_mon,            &tm_year ) == 6 &&         scan_mon( str_mon, &tm_mon ) ) *************** *** 253,259 ****      }     /* HH:MM:SS GMT DD mth YY */ !   else if ( sscanf( cp, "%d:%d:%d GMT %d %[a-zA-Z] %d",            &tm_hour, &tm_min, &tm_sec, &tm_mday, str_mon,            &tm_year ) == 6 &&         scan_mon( str_mon, &tm_mon ) ) --- 253,259 ----      }     /* HH:MM:SS GMT DD mth YY */ !   else if ( sscanf( cp, "%d:%d:%d GMT %d %400[a-zA-Z] %d",            &tm_hour, &tm_min, &tm_sec, &tm_mday, str_mon,            &tm_year ) == 6 &&         scan_mon( str_mon, &tm_mon ) ) *************** *** 267,273 ****      }     /* wdy, DD-mth-YY HH:MM:SS GMT */ !   else if ( sscanf( cp, "%[a-zA-Z], %d-%[a-zA-Z]-%d %d:%d:%d GMT",            str_wday, &tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,            &tm_sec ) == 7 &&         scan_wday( str_wday, &tm_wday ) && --- 267,273 ----      }     /* wdy, DD-mth-YY HH:MM:SS GMT */ !   else if ( sscanf( cp, "%400[a-zA-Z], %d-%400[a-zA-Z]-%d %d:%d:%d GMT",            str_wday, &tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,            &tm_sec ) == 7 &&         scan_wday( str_wday, &tm_wday ) && *************** *** 283,289 ****      }     /* wdy, DD mth YY HH:MM:SS GMT */ !   else if ( sscanf( cp, "%[a-zA-Z], %d %[a-zA-Z] %d %d:%d:%d GMT",            str_wday, &tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,            &tm_sec ) == 7 &&         scan_wday( str_wday, &tm_wday ) && --- 283,289 ----      }     /* wdy, DD mth YY HH:MM:SS GMT */ !   else if ( sscanf( cp, "%400[a-zA-Z], %d %400[a-zA-Z] %d %d:%d:%d GMT",            str_wday, &tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,            &tm_sec ) == 7 &&         scan_wday( str_wday, &tm_wday ) && *************** *** 299,305 ****      }     /* wdy mth DD HH:MM:SS GMT YY */ !   else if ( sscanf( cp, "%[a-zA-Z] %[a-zA-Z] %d %d:%d:%d GMT %d",            str_wday, str_mon, &tm_mday, &tm_hour, &tm_min, &tm_sec,            &tm_year ) == 7 &&         scan_wday( str_wday, &tm_wday ) && --- 299,305 ----      }     /* wdy mth DD HH:MM:SS GMT YY */ !   else if ( sscanf( cp, "%400[a-zA-Z] %400[a-zA-Z] %d %d:%d:%d GMT %d",            str_wday, str_mon, &tm_mday, &tm_hour, &tm_min, &tm_sec,            &tm_year ) == 7 &&         scan_wday( str_wday, &tm_wday ) && A (2.05) complete version can be downloaded from: http://www.acme.com/software/thttpd/thttpd-2.05.tar.gz Fix information SuSE has already released a fixed package of thttpd: SuSE 6.2 ftp://ftp.suse.com/pub/suse/i386/update/6.2/n1/thttpd-2.04-31.i386.rpm SuSE 6.3 ftp://ftp.suse.com/pub/suse/i386/update/6.3/n1/thttpd-2.04-31.i386.rpm  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 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