Vulnerability in org.opencastproject:opencast-common (CVE-2021-43807)
Summary
Vulnerability in org.opencastproject:opencast-common (CVE-2021-43807). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 9.10 or later.
Original description
The description as published by the source.
Opencast versions prior to 9.10 allow HTTP method spoofing, allowing to change the assumed HTTP method via URL parameter. This allows attackers to turn HTTP GET requests into PUT requests or an HTTP form to send DELETE requests. This bypasses restrictions otherwise put on these types of requests and aids in cross-site request forgery (CSRF) attacks, which would otherwise not be possible.
Impact
The vulnerability allows attackers to craft links or forms which may change the server state. For example, the following GET request would create a new user:
% curl -i -u admin:opencast \
'https://legacy.opencast.org/admin-ng/users/test.json?_method=PUT&username=test&password=attack'
HTTP/2 200
…
If an admin is logged in to legacy.opencast.org and accidentally clicks this link, a user will silently be created.
Patches
This issue is fixed in Opencast 9.10 and 10.0.
Workarounds
You can mitigate the problem by setting the SameSite=Strict attribute for your cookies. If this is a viable option for you depends on your integrations. We strongly recommend updating in any case.
References
For more information
If you have any questions or comments about this advisory:
- Open an…
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2021-43807 has been found in org.opencastproject:opencast-common.
Successful exploitation can lead to full system takeover.
What to do: upgrade org.opencastproject:opencast-common to 9.10 or later.
If unsure, ask your IT team or search "org.opencastproject:opencast-common CVE-2021-43807" on the vendor's site.
CVE-2021-43807 (org.opencastproject:opencast-common) — CWE-290
Attack vector: remote (network-reachable) / unauthenticated
Patched: 9.10 — apply immediately
Workaround: You can mitigate the problem by setting the SameSite=Strict attribute for your cookies.
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-290) exists in org.opencastproject:opencast-common.
Check the vendor advisory for the affected versions of org.opencastproject:opencast-common.
Severity: ?. Successful exploitation can lead to full system takeover.
Update to 9.10.
Workaround: You can mitigate the problem by setting the SameSite=Strict attribute for your cookies.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで org.opencastproject:opencast-common を使っているサービスとバージョンを洗い出す。
-
2Apply temporary workaround mitigate
You can mitigate the problem by setting the `SameSite=Strict` attribute for your cookies.パッチが適用されるまでの応急処置として、You can mitigate the problem by setting the
SameSite=Strictattribute for your cookies. を実施。回避策の副作用 (機能低下) を確認した上で。 -
3Apply patch patch
Upgrade org.opencastproject:opencast-common to 9.10ステージング環境で 9.10 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を含めること。
-
4Post-deployment verification 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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com