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iqm id:iqm

networkã«é–¢ã™ã‚‹iqmã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (297)

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ncã‚³ãƒžãƒ³ãƒ‰ã¨bashã®/dev/tcpã§é€šä¿¡ - suztomoã®ã¯ã¦ãªãƒ€ã‚¤ã‚¢ãƒªãƒ¼
netcatã‚³ãƒžãƒ³ãƒ‰ã¨bashã®/dev/tcpã‚’ä½¿ã£ã¦é€šä¿¡ã‚’ã™ã‚‹ã€‚ Reverse Shell with Bashã‚’å®Ÿè¡Œã—ã¦ã¿ã¾ã—ãŸã€‚ bashã¯tcpã®é€šä¿¡ã‚’/dev/tcp/host/portã¨ã„ã†ãƒ•ã‚¡ã‚¤ãƒ«ã¸ã®å…¥å‡ºåŠ›ã«è¦‹ã›ã‹ã‘ã‚‹ã“ã¨ãŒã§ãã‚‹ã€‚ ã“ã‚Œã‚’ä½¿ã£ã¦ã‚µãƒ¼ãƒã¨ã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆã§é€šä¿¡ã‚’ã—ã¦ã€é éš”æ“ä½œã‚’ã—ã¦ã¿ã‚‹ã€ã‚µãƒ¼ãƒã¨ã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆã‚’ç”¨æ„ã™ã‚‹ã‘ã‚Œã©ã€ã“ã®ä¾‹ã§ã¯æŽ¥ç¶šã—ã¦ããŸã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆã‚’ã‚µãƒ¼ãƒå´ã§æ“ä½œã™ã‚‹ã¨ã„ã†ã‚‚ã®ã€‚ ã¾ãšnc(netcat)ã‚³ãƒžãƒ³ãƒ‰ã‚’ã‚µãƒ¼ãƒã§å®Ÿè¡Œã™ã‚‹ã€‚-lã§listen mode.ã“ã“ã§ã¯tcpã®8080ç•ªãƒãƒ¼ãƒˆã§å¾…ã¡å—ã‘ã‚‹ã“ã¨ã«ã—ãŸã€‚*1 æ¬¡ã«ã€ã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆã§ã¯bashã«ã‚·ã‚§ãƒ«ã‚’å¤‰æ›´ã—ã¦ã€ãƒ•ã‚¡ã‚¤ãƒ«ãƒ‡ã‚£ã‚¹ã‚¯ãƒªãƒ—ã‚¿ã®5ç•ªã‚’/dev/tcp/[ã‚µãƒ¼ãƒã®ã‚¢ãƒ‰ãƒ¬ã‚¹]/[ã‚µãƒ¼ãƒãŒå¾…ã¡å—ã‘ã¦ã‚‹ãƒãƒ¼ãƒˆ]ã«ã‚€ã™ã³ã¤ã‘ã‚‹ã€‚*2 ã†ã¾ãç¹‹ã‚‹ã¨ã‚µãƒ¼ãƒå´ã«ç¹‹ã£ãŸæ—¨ãŒè¡¨ç¤ºã•ã‚ŒãŸã€‚ ã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆå´ã§
iqm 2014/09/25
bash

network
ãƒªãƒ³ã‚¯
The Zeek Network Security Monitor
Zeek has been a cornerstone of the open-source and cybersecurity communities for decades. Originally developed by Vern Paxson in the 1990s under the name â€œBro,â€ Zeek was designed to provide deep insights into network activity across university and national lab networks. In 2018, the project was renamed Zeek to reflect its growing role and evolution in the world of network security. Today, Zeek rem
iqm 2013/12/06
network

security
ãƒªãƒ³ã‚¯
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ãƒ‰ã‚¤ãƒ„ã®ç ”ç©¶è€…ãŒã€ã‚³ãƒ³ãƒ”ãƒ¥ãƒ¼ã‚¿å†…è”µã®ã‚¹ãƒ”ãƒ¼ã‚«ãƒ¼ã¨ãƒžã‚¤ã‚¯ã‚’é€šä¿¡æ‰‹æ®µã«åˆ©ç”¨ã—ã¦ã€å¯†ã‹ã«ãƒ‡ãƒ¼ã‚¿ã‚’æµå‡ºã•ã›ã‚‹æ–¹æ³•ã‚’å®Ÿè¨¼ã—ãŸã€‚ è¶…éŸ³æ³¢ã‚’ä½¿ã£ã¦ã‚³ãƒ³ãƒ”ãƒ¥ãƒ¼ã‚¿é–“ã§ç„¡ç·šé€šä¿¡ã‚’ç¢ºç«‹ã—ã€ãƒžãƒ«ã‚¦ã‚§ã‚¢ã«æ„ŸæŸ“ã•ã›ãŸã‚·ã‚¹ãƒ†ãƒ ã‹ã‚‰ãƒ‡ãƒ¼ã‚¿ã‚’æµå‡ºã•ã›ã‚‹æ–¹æ³•ã‚’å®Ÿè¨¼ã—ãŸã¨ã—ã¦ã€ãƒ‰ã‚¤ãƒ„ã®ç ”ç©¶è€…ãŒé€šä¿¡å¦ä¼šèªŒJournal of Communicationsã«è«–æ–‡ã‚’ç™ºè¡¨ã—ãŸã€‚ ç™ºè¡¨ã«ã‚ˆã‚‹ã¨ã€ã“ã®æ–¹æ³•ã§ã¯ã‚ªãƒ¼ãƒ‡ã‚£ã‚ªå¤‰èª¿ã¨å¾©èª¿ã‚’åˆ©ç”¨ã—ã¦ã€è¶…éŸ³æ³¢å‘¨æ³¢æ•°çµŒç”±ã§ã‚³ãƒ³ãƒ”ãƒ¥ãƒ¼ã‚¿é–“ã®ãƒ‡ãƒ¼ã‚¿äº¤æ›ã‚’è¡Œã†ã€Œéš ã—ãƒãƒ£ãƒãƒ«ã€ã‚’ç¢ºç«‹ã—ãŸã€‚ã“ã‚Œã¯ã€ã‚‚ã¨ã‚‚ã¨æ°´ä¸é€šä¿¡ç”¨ã«è¨è¨ˆã•ã‚ŒãŸé€šä¿¡ã‚·ã‚¹ãƒ†ãƒ ã‚’å¿œç”¨ã—ãŸã¨ã„ã†ã€‚ ã“ã®ç§˜å¯†éŸ³éŸ¿ç„¡ç·šé€šä¿¡ã¯ã€ç¬¬3ã®ç„¡ç·šæ©Ÿã«ã‚ˆã£ã¦é€šä¿¡ã‚’ä¸ç¶™ã™ã‚‹ãƒžãƒ«ãƒãƒ›ãƒƒãƒ—é€šä¿¡ã‚„ã€ç„¡ç·šãƒ¡ãƒƒã‚·ãƒ¥ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã«ã‚‚æ‹¡å¼µã§ãã‚‹ã¨ç ”ç©¶è€…ã¯èª¬æ˜Žã™ã‚‹ã€‚ã‚³ãƒ³ãƒ”ãƒ¥ãƒ¼ã‚¿å†…è”µã®ã‚¹ãƒ”ãƒ¼ã‚«ãƒ¼ã¨ãƒžã‚¤ã‚¯ã‚’é€šä¿¡æ‰‹æ®µã«åˆ©ç”¨ã—ã¦ã€å¯†ã‹ã«ãƒ‡ãƒ¼ã‚¿ã‚’æµå‡ºã•ã›ã‚‰ã‚Œã‚‹ã“ã¨ã‚’å®Ÿè¨¼ã—ãŸã¨ã—ã¦ã„ã‚‹ã€‚ ç§˜å¯†éŸ³éŸ¿
iqm 2013/12/04
network
ãƒªãƒ³ã‚¯
Linuxã®TCP SYNã®å†é€é–“éš”ã®åˆæœŸå€¤ãŒ3ç§’ã‹ã‚‰1ç§’ã«å¤‰æ›´ã•ã‚Œã¦ã„ãŸ - å…ƒRX-7ä¹—ã‚Šã®é©å½“ãªæ—¥ã€…
ã¨ã„ã†ã“ã¨ã«ã€(ä»Šæ›´ï¼Ÿ)æ°—ä»˜ã„ãŸãŠè©±ã§ã™ã€‚ HAã‚’çµ„ã‚“ã éš›ã®VIPã®åˆ‡ã‚Šæ›¿ãˆãƒ†ã‚¹ãƒˆã‚’ã‚„ã£ã¦ã„ã‚‹ã¨ãã«ã€é«˜è² è·æ™‚ã¨ã‹ã¯åˆ‡ã‚Šæ›¿ãˆã«7ç§’ã´ã£ãŸã‚Šã‹ã‹ã‚‹ã‚±ãƒ¼ã‚¹ã¨ã‹ãŒã‚ã£ã¦ã€7ç§’ã£ã¦ä½•ã®æ•°å—ã ã‚ã†ã¨ç–‘å•ã‚’æŒã¡ã¾ã—ãŸã€‚ OSã¯ã€CentOS 6.4(2.6.32-358.23.2.el6.x86_64)ã§ã™ã€‚ TCP SYNã®å†é€é–“éš”ãŒã€1...2...4...ç§’ã«ãªã£ã¦ã„ã‚‹ ã§ã€tcpdumpã‚’çœºã‚ã¦ã„ã‚‹ã¨ä»¥ä¸‹ã®ã‚ˆã†ãªã‚·ãƒ¼ã‚±ãƒ³ã‚¹ã§ã™ã€‚ 11:50:35.689301 IP client-host.8957 > server-host.http: Flags [S], seq 1616681830, win 14600, options [mss 1460,sackOK,TS val 889880946 ecr 0,nop,wscale 7], length 0 11:50:36.688503 IP
iqm 2013/11/29
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linux

kernel

TCP

network
ãƒªãƒ³ã‚¯
[PDF]ä¸å›½ã§Greatã ã‚ˆ
ä¸å›½ã§Greatã ã‚ˆ Matsuzaki â€˜mazâ€™ Yoshinobu <maz@iij.ad.jp> 2013/08 @ APNIC36 network maz@iij.ad.jp 1 ä½•ã ã‹ã‚¢ã‚¯ã‚»ã‚¹ã§ããªã„ã‚ˆ Twitter Facebook YouTube ERR_TIMED_OUT ERR_TIMED_OUT ERR_NAME_RESOLUTIN_FAILED maz@iij.ad.jp 2 APNICãŒç”¨æ„ã—ãŸãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã ã‚ˆ â€¢ AS# â€“ 24555 â€¢ IPã‚¢ãƒ‰ãƒ¬ã‚¹ â€“ 220.247.144.0/20 - transited by AS7497 â€“ 2001:df9::/32 - transited by AS4837 â€¢ ã‚ãƒ£ãƒƒã‚·ãƒ¥DNS â€“ BIND9 â€“ åŒã˜ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯å†…ã§IPv4/IPv6 dual stack ã ã‚ˆ maz@iij.ad.jp 3 Twitt
iqm 2013/09/03
Mazã•ã‚“é€ƒã’ã¦ãƒ¼/ UDP/53ã®å½å¿œç”ã‚‚ã¡ã‚‡ã¡ã‚‡ã„ã¨Filterã‹ã‘ã¦ã‚„ã‚Œã°è½ã¨ã›ãã†ã

dns

network

security
ãƒªãƒ³ã‚¯
ãªãœ QUIC ã‚„ SPDY ãŒç”Ÿã¾ã‚ŒãŸã®ã‹ ? - Block Rockinâ€™ Codes
Intro Google ãŒ SPDY ã®é–‹ç™ºã‚’å§‹ã‚ãŸã®ã¯ 2009 å¹´ã§ã€ 2012 å¹´ã« HTTP2.0 ã®ãƒ‰ãƒ©ãƒ•ãƒˆã¨ã—ã¦æŽ¡ç”¨ã•ã‚ŒãŸã‚ãŸã‚Šã‹ã‚‰ã¡ã‚‡ã£ã¨è©±é¡Œã«ãªã‚Šã¾ã—ãŸã€‚ ç¿Œ 2 æœˆã«ã¯æ–°ãŸãªãƒ—ãƒãƒˆã‚³ãƒ« QUIC ã®å˜åœ¨ãŒ Chromium ã®ã‚½ãƒ¼ã‚¹ã‹ã‚‰ãƒªãƒ¼ã‚¯ã—ãŸã®ã§ã™ãŒã€ã—ã°ã‚‰ãã¯éŸ³æ²™æ±°ãªãã€‚ 6 æœˆã«å…¥ã£ã¦ã‚„ã£ã¨ Google ã‹ã‚‰å…¬å¼ã‚¢ãƒŠã‚¦ãƒ³ã‚¹ã¨ãƒ‰ã‚ãƒ¥ãƒ¡ãƒ³ãƒˆé¡žãŒå‡ºã¾ã—ãŸã€‚ åŽ»å¹´ã‹ã‚‰ä»Šå¹´ã«ã‹ã‘ã¦ç«‹ã¦ç¶šã‘ã«å‡ºã¦ãã‚‹æ–°ã—ã„ãƒ—ãƒãƒˆã‚³ãƒ«ã®è©±ã€‚ ãªãœä»Š Web ã®ãƒ—ãƒãƒˆã‚³ãƒ«ãŒè¦‹ç›´ã•ã‚Œã‚‹ã®ã‹ï¼Ÿ ä½•ãŒå•é¡Œã§ã€ãªãœ Google ã¯ãã‚Œã‚‰ã‚’ä½œã‚Šå¤‰ãˆã‚‹ã®ã‹ï¼Ÿ SPDY ã‚„ QUIC ã¯ Google ã®ç‹¬è‡ªãƒ—ãƒãƒˆã‚³ãƒ«ã ã‘ã©ã€ãã‚Œã¯æœ¬å½“ã«ãŸã ã®ç‹¬è‡ªãƒ—ãƒãƒˆã‚³ãƒ«ã§çµ‚ã‚ã‚‰ã›ã¦ã„ã„ã®ã‹ï¼Ÿ 20% ãƒ«ãƒ¼ãƒ«ã§ä½œã£ã¦ã¿ãŸ Play ãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆã§ã—ã‹ãªã„ã®ã‹ï¼Ÿ ã“ã†ã—ãŸæ–°ã—ã„å‹•ãã«ã¯ã€ã‹ãªã‚‰ãšã€Œãã‚Œã¾ã§ã€ã¨ã€Œä»Šã€ã‚’è¸
iqm 2013/07/23
SPDY

network

protocol

quic
ãƒªãƒ³ã‚¯
Googleã®æ–°ãƒ—ãƒãƒˆã‚³ãƒ«QUICã‚’è©¦ã™ - ã¼ã¡ã¼ã¡æ—¥è¨˜
1.QUICä»•æ§˜ã®å…¬é–‹ ä»¥å‰ã€ã€ŒGoogleãŒä»•æŽ›ã‘ã‚‹æ–°ãƒ—ãƒãƒˆã‚³ãƒ«QUICã¨ã¯ä½•ã‹ã€ã®ãƒ–ãƒã‚°ã‚¨ãƒ³ãƒˆãƒªãƒ¼ã‚’æ›¸ã„ãŸã®ãŒ2æœˆæœ«ã®äº‹ã§ã—ãŸã€‚ãã‚Œã‹ã‚‰4ã‹æœˆçµŒã¡ã€ä»ŠæœGoogleãŒåˆã‚ã¦QUICã®å…¬è¡¨(Chromium Blog: Experimenting with QUIC)ã‚’è¡Œã„ã¾ã—ãŸã€‚ IE11ã®SPDY/3å¯¾å¿œãŒåˆ¤æ˜Žã—ãŸç›´å¾Œã§ã—ãŸã€‚ãªã‚“ã¨ã„ã†ã‚¿ã‚¤ãƒŸãƒ³ã‚°ã§ã—ã‚‡ã†ã‹ã€‚ ã¾ãŸã€è¿‘ã„ã†ã¡ï¼ˆæ¥é€±ï¼Ÿï¼‰ã«ã¯ HTTP/2.0 ã® Implementation Draft ãŒå…¬é–‹ã•ã‚Œã‚‹äºˆå®šã§ã™ã€‚8æœˆä¸Šæ—¬ã«ã¯ã€Googleã‚„Microsoftç‰ãŒé›†ã¾ã£ã¦åˆã‚ã¦ã® HTTP/2.0 ã®ç›¸äº’æŽ¥ç¶šè©¦é¨“ã‚’è¡Œã†äºˆå®šã§ã™ã€‚ãŸã ä»ŠHTTPé–¢é€£ã®ãƒ—ãƒãƒˆã‚³ãƒ«ãŒæ€¥æ¿€ã«é€²åŒ–ã™ã‚‹çœŸã£æœ€ä¸ã§ã™ã€‚ç›®ãŒé›¢ã›ã¾ã›ã‚“ã€‚ 2. ã§ã€QUICã¨ã¯ä½•ãªã®ã‹ï¼Ÿ å…ˆã®Chromium Blogã®ã‚¨ãƒ³ãƒˆãƒªãƒ¼ã§QUICã¯ã€ ã€ŒQuick UDP Inte
iqm 2013/07/01
network

protocol
ãƒªãƒ³ã‚¯
10GbEæ™‚ä»£ã®ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯I/Oé«˜é€ŸåŒ–
10GbEã€40GbEãªã©ã®æ¥µã‚ã¦é«˜é€Ÿãªé€šä¿¡ã‚’ã‚µãƒãƒ¼ãƒˆã™ã‚‹NICãŒã€PCã‚µãƒ¼ãƒã®é ˜åŸŸã§ã‚‚ä½¿ã‚ã‚Œã‚‹ã‚ˆã†ã«ãªã£ã¦ãã¦ã„ã‚‹ã€‚ ã“ã®ã‚ˆã†ãªé€Ÿåº¦ã®é€šä¿¡ã‚’ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ï¼ˆOSï¼‰ã§å‡¦ç†ã—é«˜ã„æ€§èƒ½ã‚’å¾—ã‚‹ã«ã¯æ§˜ã€…ãªéšœå®³ãŒã‚ã‚Šã€ãƒãƒ¼ãƒ‰ã‚¦ã‚§ã‚¢ãƒ»ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ä¸¡é¢ã®å®Ÿè£…ã‚’è¦‹ç›´ã™å¿…è¦ãŒã‚ã‚‹ã€‚ æœ¬ã‚»ãƒƒã‚·ãƒ§ãƒ³ã§ã¯ã€ãƒãƒ¼ãƒ‰ã‚¦ã‚§ã‚¢ãƒ»ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ä¸¡é¢ã«ã©ã®ã‚ˆã†ãªæ”¹è‰¯ãŒè¡Œã‚ã‚Œã¦ãã¦ãŠã‚Šã€æ€§èƒ½ã‚’å¼•ãå‡ºã™ã«ã¯ã©ã®ã‚ˆã†ã«ã“ã‚Œã‚‰ã‚’ä½¿ç”¨ã—ãŸã‚‰ã‚ˆã„ã®ã‹ã«ã¤ã„ã¦ç´¹ä»‹ã™ã‚‹ã€‚Read less
iqm 2013/06/10
network
ãƒªãƒ³ã‚¯
Linux kernel 3.9 ã®æ–°æ©Ÿèƒ½ SO_REUSEPORT ã‚’è©¦ã—ã¦ã¿ã‚‹ - nigakyã®ãƒ–ãƒã‚°
Linux kernel 3.9 ã®ãƒžãƒ¼ã‚¸ã‚¦ã‚£ãƒ³ãƒ‰ã‚¦ã§ã¯ SO_REUSEPORT ã¨ã„ã†ã‚½ã‚±ãƒƒãƒˆã‚ªãƒ—ã‚·ãƒ§ãƒ³ãŒãƒžãƒ¼ã‚¸ã•ã‚Œã¾ã—ãŸã€‚ Merge branch 'soreuseport' Â· c617f39 Â· torvalds/linux Â· GitHub ã“ã‚Œã¯åŒä¸€ãƒãƒ¼ãƒˆã«è¤‡æ•°ã®ãƒªã‚¹ãƒŠãƒ¼ï¼ˆlisten ã‚½ã‚±ãƒƒãƒˆï¼‰ãŒ bind ã§ãã‚‹ã‚ˆã†ã«ãªã‚‹ã¨ã„ã†ã‚‚ã®ã§ã€Webã‚µãƒ¼ãƒãªã©å˜ä¸€ã®ãƒãƒ¼ãƒˆã«å¤šãã®ã‚³ãƒã‚¯ã‚·ãƒ§ãƒ³ãŒæ¥ã‚‹ã‚ˆã†ãªãƒ¯ãƒ¼ã‚¯ãƒãƒ¼ãƒ‰ã§ã€è¤‡æ•°ãƒ—ãƒã‚»ã‚¹ã§ã†ã¾ãè² è·åˆ†æ•£ãŒã§ãã‚‹ã‚ˆã†ã«ãªã‚‹ãã†ã§ã™ã€‚ ï¼ˆã“ã‚Œã¾ã§ã ã¨ä¸€äººãŒaccept()ã—ã¦ãã‚Œãžã‚Œã® worker ã«æ¸¡ã™ã¨ã„ã†ã‚ˆã†ãªãƒ¢ãƒ‡ãƒ«ãŒã‚ã‚Šã¾ã—ãŸãŒã€ã“ã‚Œã§ã¯ accept() ã™ã‚‹éƒ¨åˆ†ãŒãƒœãƒˆãƒ«ãƒãƒƒã‚¯ã«ãªã£ã¦ã—ã¾ã„ãŒã¡ã§ã—ãŸã€‚ï¼‰ BSDã§ã¯å…ƒã€… SO_REUSEPORT ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã¯ã‚ã£ãŸã‚ˆã†ã§ã™ãŒã€ãƒžãƒ«ãƒã‚ãƒ£ã‚¹ãƒˆé€šä¿¡ã§ä½¿ã†ã‚‚ã®ã®ã‚ˆã†ã§ã™ã€‚Linux
iqm 2013/05/17
Nodeã¿ãŸã„ãªãƒŽãƒ³ãƒ–ãƒãƒƒã‚ãƒ³ã‚°ã®ã¨çµ„ã¿åˆã‚ã›ã‚‹ã¨æœ€å¼·ã«å¼·ã¾ã‚‹æ°—ãŒã™ã‚‹

linux

kernel

network
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