{"id":24645,"date":"2024-04-04T09:01:44","date_gmt":"2024-04-04T00:01:44","guid":{"rendered":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=24645"},"modified":"2024-04-04T09:01:44","modified_gmt":"2024-04-04T00:01:44","slug":"xz%e3%81%abssh%e3%81%ae%e3%83%90%e3%83%83%e3%82%af%e3%83%89%e3%82%a2","status":"publish","type":"post","link":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=24645","title":{"rendered":"xz\u306bssh\u306e\u30d0\u30c3\u30af\u30c9\u30a2"},"content":{"rendered":"\n

久しぶりにセキュリティー界騒然の事態ですね．劇場型のやり取りなどで3年がかりでxzのメインテナーに加わった人物がxzにsshのバックドアを仕組んだ<\/a>そうで，スパイ映画さながらです．<\/p>\n\n\n\n

問題になるのは，xz (liblzma) 5.6.0と5.6.1だそうです．日常的なファイルの圧縮展開に利用されるばかりでなく，圧縮効率が高いため1<\/a><\/sup>圧縮のスピードはかなり遅いですが😅<\/span>多くのdistroがパッケージをxzで圧縮して配布していてます．<\/p>\n\n\n\n

手元のMac miniではMacPortsを使っているのでxzが入っているはずです．調べてみると（注意: xzコマンドを発行してバージョンを調べるのは危険かもしれません<\/a><\/mark><\/strong>），<\/p>\n\n\n

\n
\"\"<\/figure>\n<\/div>\n\n\n

まさにドンピシャのものが入ってました．早速，<\/p>\n\n\n\n

port selfupdate\nport upgrade outdated<\/code><\/pre>\n\n\n\n
をかけたら，安全とされる古いバージョンに戻りました．<\/p>\n\n\n
\n
\"\"<\/figure>\n<\/div>\n\n\n
ちなみに，手元のいくつかのdistroで調べたところ，Slackware64とARM (32bit)の15.0は5.2.5で問題なし2<\/a><\/sup>ただし，Slackware AArch64 currentは5.6.1です．他のアーキテクチャーのcurrentも5.6.1の可能性が高いです．<\/span>，Debian BookwormとRaspberry Pi OS Bookwormも5.4.1で問題なしですが，ManjaroはAMD64, ARM64とも5.6.1<\/mark><\/strong>で今のところupdateは来てません（2024年4月4日09:35JST現在）3<\/a><\/sup>Manjaroは配布パッケージの圧縮にgzipを使っているようなので．ユーザーがxzをなにかの目的で使わなければ大丈夫なのかもしれません．<\/span>．<\/p>\n","protected":false},"excerpt":{"rendered":"
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