Open Redirect in omero-web (CVE-2021-21377)
Summary
Vulnerability in omero-web (CVE-2021-21377). Confidential information can be exposed externally. Exploitable via omero.web.redirect_allowed_hosts. Mitigation: upgrade to 5.9.0 or later.
Original description
The description as published by the source.
Background
OMERO.web supports redirection to a given URL after performing login or switching the group context. These URLs are not validated, allowing redirection to untrusted sites. OMERO.web 5.9.0 adds URL validation before redirecting. External URLs are not considered valid, unless specified in the omero.web.redirect_allowed_hosts setting.
Impact
OMERO.web before 5.9.0
Patches
5.9.0
Workarounds
No workaround
References
For more information
If you have any questions or comments about this advisory:
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-2021-21377 has been found in omero-web.
Attackers can target a specific entry point like omero.web.redirect_allowed_hosts over the network to misuse the product.
Confidential information can be exposed externally.
What to do: upgrade omero-web to 5.9.0 or later.
If unsure, ask your IT team or search "omero-web CVE-2021-21377" on the vendor's site.
CVE-2021-21377 (omero-web) — CWE-601
Attack vector: remote (network-reachable)
Attack surface: omero.web.redirect_allowed_hosts
Patched: 5.9.0 — apply immediately
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-601) exists in omero-web. Attackers reach the vulnerable code path via omero.web.redirect_allowed_hosts.
Check the vendor advisory for the affected versions of omero-web. Attack surface: omero.web.redirect_allowed_hosts.
Severity: ?. Confidential information can be exposed externally.
Update to 5.9.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'omero-web' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'omero-web' . | 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
omero-webを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade omero-web to 5.9.0ステージング環境で 5.9.0 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。
-
3Post-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
- web github.com
- web pypi.org
- web openmicroscopy.org