ru.cisco

 
 - RU.CISCO ---------------------------------------------------------------------
 From : Eugene Grosbein                      2:5006/1       03 May 2003  16:48:28
 To : All
 Subject : buffer overflow
 -------------------------------------------------------------------------------- 
 

 
 Запрос файла:
 
 ---------------------------------------------------------------------------
 Packet 1
 TIME:  16:32:20.182421
 LINK:  00:10:7B:B3:22:E0 -> 00:02:B3:26:A9:52 type=IP
   IP:  gw-c-5 -> hq hlen=20 TOS=00 dgramlen=42 id=0001
   MF/DF=0/0 frag=0 TTL=255 proto=UDP cksum=8DC5
  UDP:  port 7386 -> tftp hdr=8 data=14
 DATA:  ..c2600.octet.
 
 Пошли данные:
 ---------------------------------------------------------------------------
 Packet 2
 TIME:  16:32:20.210834 (0.028413)
 LINK:  00:02:B3:26:A9:52 -> 00:10:7B:B3:22:E0 type=IP
   IP:  hq -> gw-c-5 hlen=20 TOS=00 dgramlen=544 id=2F72
   MF/DF=0/0 frag=0 TTL=64 proto=UDP cksum=1B5F
  UDP:  port 3629 -> 7386 hdr=8 data=516
 DATA:  .....ELF...............+...........4...T.....4. ...(........
   .............[.l.^R...............................7T........
   ...........!...........T..8H.......................1........
   ......@....P...................1...........@..D4.[.,........
   .........!..|.......=@..aJ...*..=@..aJ...j..=@..aJ......H..Q
   =@..aJ...j..=@..aJ..}J..8*......H...H...K...D...N.. .!..|...
   .....$..U .<|.J.T..:|...|.(@@..<.C...c...#..H....
   ......9J..9k..9)..,  ..A...8c..|.(@A...|p..Tc..<...|..x|p..L.
   .,....|  ...$...d..........8!..|...N.. }(..|x..
 
 Подтверждение?
 ---------------------------------------------------------------------------
 Packet 3
 TIME:  16:32:20.213232 (0.002398)
 LINK:  00:10:7B:B3:22:E0 -> 00:02:B3:26:A9:52 type=IP
   IP:  gw-c-5 -> hq hlen=20 TOS=00 dgramlen=32 id=0002
   MF/DF=0/0 frag=0 TTL=255 proto=UDP cksum=8DCE
  UDP:  port 7386 -> 3629 hdr=8 data=4
 DATA:  ....
 
 И так далее:
 ---------------------------------------------------------------------------
 Packet 4
 TIME:  16:32:20.213425 (0.000193)
 LINK:  00:02:B3:26:A9:52 -> 00:10:7B:B3:22:E0 type=IP
   IP:  hq -> gw-c-5 hlen=20 TOS=00 dgramlen=544 id=7C1B
   MF/DF=0/0 frag=0 TTL=64 proto=UDP cksum=CEB5
  UDP:  port 3629 -> 7386 hdr=8 data=516
 DATA:  ....tc..@..5|p..tc..@...}(..N.. |p..Tc..<...|..x|p..L..,N.. 
   |...|x..8...Tc..<...|..x|...=...a...|.@8(...A...(...A...<...
   `...H...<...`...|...|x..`...|...|x..8...|.(@A...L..,|...|x..
   Tc..<.
   .|..x|x..L..,|x..Tc..<...|..x|x..L..,N.. N.. .!..|..........
   .|..x8`.....x8...H...K....!..|...........|..x....|  .x,...A..
   8} .t,..
   @...8`..8...K.......8`..|..tK....?..,   ..@.......|.......8!..
   N.. .!..|..........$|.#xK...8..0....8..x...  9@..9... 
   ..T..:...0T..>,..   A...9*..8..0H...9*..8..7|.I.9J..,
   ..@...8..
   ....8.......8a..K......$
 
 ---------------------------------------------------------------------------
 Packet 5
 TIME:  16:32:20.215741 (0.002316)
 LINK:  00:10:7B:B3:22:E0 -> 00:02:B3:26:A9:52 type=IP
   IP:  gw-c-5 -> hq hlen=20 TOS=00 dgramlen=32 id=0003
   MF/DF=0/0 frag=0 TTL=255 proto=UDP cksum=8DCD
  UDP:  port 7386 -> 3629 hdr=8 data=4
 DATA:  ....
 
 [skip]
 
 И почти сразу:
 
 ---------------------------------------------------------------------------
 Packet 20
 TIME:  16:32:20.234720 (0.000181)
 LINK:  00:02:B3:26:A9:52 -> 00:10:7B:B3:22:E0 type=IP
   IP:  hq -> gw-c-5 hlen=20 TOS=00 dgramlen=544 id=DA57
   MF/DF=0/0 frag=0 TTL=64 proto=UDP cksum=7079
  UDP:  port 3629 -> 7386 hdr=8 data=516
 DATA:  ...
   8!..N.. .!..|.......|d.x8`.4K..9....|...8!..N.. .!..|.......
   8`.5K.......|...8!..N.. .!..|.......|d.x8`.%K.......|...8!..
   N.. .!..|.......8`."K.......|...8!..N.. .!..|.......|d.x8`.#
   K.......|...8!..N.. .!..|.......8`..K..}....|...8!..N.. .!..
   |.......8`..K..Y....|...8!..N.. .!..|.......8`..K..5....|...
   8!..N.. .!..|.......8`..K.......|...8!..N.. .!..|.......8`.$
   K.......|...8!..N.. .!..|.......8`.'K.......|...8!..N.. .!..
   |.......8`.*K.......|...8!..N.. .!..|.......|`.x|.#x|.+x8`.+
   |..x}%KxK..m....|...8!..N.. .!..
 
 ---------------------------------------------------------------------------
 Packet 21
 TIME:  16:32:20.235361 (0.000641)
 LINK:  00:10:7B:B3:22:E0 -> 00:02:B3:26:A9:52 type=IP
   IP:  gw-c-5 -> hq hlen=20 TOS=00 dgramlen=48 id=000B
   MF/DF=0/0 frag=0 TTL=255 proto=UDP cksum=8DB5
  UDP:  port 7386 -> 3629 hdr=8 data=20
 DATA:  ....Buffer overflow.
 ---------------------------------------------------------------------------
 
 Конец.
 
 И чего делать? Загрузчик в ROM 11.3(2)XA2, другого взять негде.
 После загрузки из flash IOS уже нормально читает с tftp.
 
 Eugene
 --- slrn/0.9.7.4 (FreeBSD)
  * Origin: Svyaz Service JSC (2:5006/1@fidonet)
 
 

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