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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	Ethereal DistCC Buffer Overflow 10 May. 2005    Summary Ethereal is "a widely used network packet capturing utility which has support for over 700 network protocols". A vulnerability in Ethereal's DistCC dissector allows attackers to cause the program to overflow an internal buffer by supplying a negative value to the memcpy() function used by the dissector.   Credit: The information has been provided by Ilja van Sprundel. 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:  * Ethereal version 0.10.10 and prior Immune Systems:  * Ethereal version 0.10.11 or newer Ethereal has a dissector for the DistCC network protocol. A stack based buffer overflow was discovered in parsing argv, serr and sout messages. Vulnerable code: static void dissect_distcc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree) {  char token[4];  guint32 parameter;  while(1){   tvb_memcpy(tvb, token, offset, 4);   ...   sscanf(tvb_get_ptr(tvb, offset, 8), "%08x", ¶meter);   ...   } else if(!strncmp(token, "ARGV", 4)){   offset=dissect_distcc_argv(tvb, pinfo, tree, offset, parameter);   }   ...  } } static int dissect_distcc_argv(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int offset, gint parameter) {  char argv[256];  int argv_len;  gint len=parameter;  argv_len=len>255?255:len;  tvb_memcpy(tvb, argv, offset, argv_len);  ... } When given a negative value for parameter the bounds check will be bypassed and an overflow in memcpy occurs. 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