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UBUNTU-CVE-2023-48795
openssh の脆弱性 (UBUNTU-CVE-2023-48795)
概要
openssh に 脆弱性 (UBUNTU-CVE-2023-48795) が存在。データの不正な改ざんを許す可能性があります。対策: `2.0.11-0ubuntu1~16.04.4+esm1` 以上に更新。
AI要約 snake-internal / snake-material-v2
openssh という製品で、UBUNTU-CVE-2023-48795 という番号がついた弱点 (脆弱性) が見つかりました。
データの不正な改ざんを許す可能性があります。重要度は CVSS スコア ?/10 です。
対策: openssh を **2.0.11-0ubuntu1~16.04.4+esm1** 以上に更新してください。
心配なら、システム担当者や製品の公式サイトで「openssh UBUNTU-CVE-2023-48795」を検索してください。
UBUNTU-CVE-2023-48795 (openssh) —
攻撃ベクター: ネットワーク経由 (リモート攻撃可) / 認証不要 / 被害者操作不要
修正バージョン: `2.0.11-0ubuntu1~16.04.4+esm1` (即時適用推奨)
対応方針: 1) SBOMで影響バージョン横断確認, 2) ステージング検証→本番更新, 3) WAF/プロキシで該当エンドポイントを監視, 4) ログでIOC調査。
参考: 当ページの『参照URL』の GHSA / vendor advisory / patched release を参照。
❓ 何が問題か
openssh に **脆弱性** (分類未定) があります。
📍 影響範囲
openssh のうち 。
🔥 重要度
重要度: ?。データの不正な改ざんを許す可能性があります
🔧 修正方法
**2.0.11-0ubuntu1~16.04.4+esm1** に更新してください。
🛡️ 暫定回避
修正版が未提供時は、影響機能の無効化・WAFルール・ネットワークACLでの遮断を検討。
🔍 検知方法
Webサーバ・プロキシ・WAFログで該当CVEのIOCに合致する不審リクエストを検索。SBOM/依存ファイルで影響バージョンを横断確認。
対応アクション (7段階)
SOC/SREチームが順番に実行すべき具体的なステップとコマンド例
-
1影響範囲の特定 identify
grep -r 'openssh' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `openssh` を grep し、稼働しているサービス・バージョンを把握する。
-
6パッチ適用 patch
Upgrade openssh to 2.0.11-0ubuntu1~16.04.4+esm1ステージング環境で 2.0.11-0ubuntu1~16.04.4+esm1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。
-
7事後検証 verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
影響パッケージ
Ubuntu:Pro:14.04:LTS
openssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:14.04:LTS
paramiko
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS
lxd
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.11-0ubuntu1~16.04.4+esm1"}]}]
Ubuntu:Pro:16.04:LTS
openssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:7.2p2-4ubuntu2.10+esm5"}]}]
Ubuntu:Pro:16.04:LTS
golang-go.crypto
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS
paramiko
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS
dropbear
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS
proftpd-dfsg
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS
putty
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS
python-asyncssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:FIPS:16.04:LTS
openssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:18.04:LTS
lxd
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.3-0ubuntu1~18.04.2+esm1"}]}]
Ubuntu:Pro:18.04:LTS
openssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:7.6p1-4ubuntu0.7+esm3"}]}]
Ubuntu:18.04:LTS
paramiko
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:18.04:LTS
dropbear
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2017.75-3ubuntu0.1~esm1"}]}]
Ubuntu:Pro:18.04:LTS
golang-go.crypto
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS
openssh-ssh1
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS
proftpd-dfsg
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS
putty
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:18.04:LTS
python-asyncssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:FIPS-updates:18.04:LTS
openssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:7.9p1-10~ubuntu18.04.fips.0.9"}]}]
Ubuntu:Pro:FIPS:18.04:LTS
openssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS
filezilla
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.46.3-1ubuntu0.1"}]}]
Ubuntu:20.04:LTS
libssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.3-2ubuntu2.4"}]}]
Ubuntu:20.04:LTS
openssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:8.2p1-4ubuntu0.10"}]}]
Ubuntu:20.04:LTS
paramiko
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.0-2ubuntu0.3"}]}]
Ubuntu:20.04:LTS
proftpd-dfsg
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.6c-2ubuntu0.1"}]}]
Ubuntu:20.04:LTS
python-asyncssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.2-1ubuntu0.1"}]}]
Ubuntu:Pro:20.04:LTS
dropbear
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2019.78-2ubuntu0.1~esm1"}]}]
Ubuntu:Pro:20.04:LTS
golang-go.crypto
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS
openssh-ssh1
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS
putty
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:FIPS-updates:20.04:LTS
openssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:8.2p1-4ubuntu0.fips.0.10"}]}]
Ubuntu:Pro:FIPS:20.04:LTS
openssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS
dropbear
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2020.81-5ubuntu0.1"}]}]
Ubuntu:22.04:LTS
filezilla
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.58.0-1ubuntu0.1"}]}]
Ubuntu:22.04:LTS
libssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.6-2ubuntu0.22.04.2"}]}]
Ubuntu:22.04:LTS
openssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:8.9p1-3ubuntu0.5"}]}]
Ubuntu:22.04:LTS
openssh-ssh1
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS
paramiko
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.3-0ubuntu1.2"}]}]
Ubuntu:22.04:LTS
putty
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:22.04:LTS
golang-go.crypto
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:22.04:LTS
python-asyncssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.5.0-1ubuntu0.1~esm1"}]}]
Ubuntu:24.04:LTS
dropbear
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS
filezilla
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.66.4-1"}]}]
Ubuntu:24.04:LTS
openssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.6p1-3ubuntu1"}]}]
Ubuntu:24.04:LTS
openssh-ssh1
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS
paramiko
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.12.0-2ubuntu4"}]}]
Ubuntu:24.04:LTS
putty
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS
python-asyncssh
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.10.1-2ubuntu0.1"}]}]
Ubuntu:Pro:24.04:LTS
golang-go.crypto
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10
dropbear
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10
golang-go.crypto
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10
openssh-ssh1
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10
proftpd-dfsg
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS
dropbear
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS
golang-go.crypto
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS
openssh-ssh1
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS
proftpd-dfsg
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
参照URL
- advisory https://ubuntu.com/security/notices/USN-6560-1
- advisory https://ubuntu.com/security/notices/USN-6561-1
- advisory https://ubuntu.com/security/notices/USN-6560-2
- advisory https://ubuntu.com/security/notices/USN-6585-1
- advisory https://ubuntu.com/security/notices/USN-6589-1
- advisory https://ubuntu.com/security/notices/USN-6598-1
- advisory https://ubuntu.com/security/notices/USN-6738-1
- advisory https://ubuntu.com/security/notices/USN-7051-1
- advisory https://ubuntu.com/security/notices/USN-7297-1
- advisory https://ubuntu.com/security/notices/USN-7292-1
- report https://ubuntu.com/security/CVE-2023-48795
- report https://terrapin-attack.com/
- report https://www.openwall.com/lists/oss-security/2023/12/18/3
- report https://github.com/ronf/asyncssh/security/advisories/GHSA-hfmc-7525-mj55
- report https://www.cve.org/CVERecord?id=CVE-2023-48795