CVE-2023-49105（owncloud owncloud server）の深刻度・悪用状況・対象バージョン
9.8 緊急（CVSS 3.x） 悪用確認済み（CISA KEV） EPSS 取得中…
概要
An issue was discovered in ownCloud owncloud/core before 10.13.1. An attacker can access, modify, or delete any file without authentication if the username of a victim is known, and the victim has no signing-key configured. This occurs because pre-signed URLs can be accepted even when no signing-key is configured for the owner of the files. The earliest affected version is 10.6.0.
実際の攻撃で悪用されています。 CISA KEV への追加日: 2026-08-27。対象製品を使っている場合は最優先で対策してください。
CISA の要求対応: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA の要求対応: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
影響を受ける製品
| ベンダー | 製品 | 対象バージョン |
|---|---|---|
| owncloud | owncloud_server | ≥ 10.6.0 かつ < 10.13.1 |
基本情報
- 公開日
- 2023-11-21
- 最終更新
- 2026-08-28
- NVD の状態
- Analyzed
- 弱点の種類
- CWE-287
対策の進め方
- 上の表で、使っている製品とバージョンが対象か確認します。
- ベンダーの公式アドバイザリ（下の参考情報の「Vendor Advisory」「Patch」）で修正版・回避策を確認します。
- 悪用が確認されているため、パッチ適用までの間もアクセス制限・侵害の痕跡確認を検討します。
- 日本語の情報は JVN iPedia で CVE-2023-49105 を検索 できます。
参考情報
- https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ Vendor Advisory
- https://owncloud.org/security Product
- https://owncloud.com/security-advisories/webdav-api-authentication-bypass-using-pre-signed-urls/ Vendor Advisory
- https://owncloud.org/security Product
- https://hunt.io/blog/chinese-speaking-operator-philippine-nuclear-naval-contractor Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-49105 US Government Resource
- NVD: CVE-2023-49105
- CVE.org: CVE-2023-49105
データ出典: NIST NVD、CISA KEV、FIRST EPSS。翻訳は参考情報で、正確性は原文を優先してください。