Vulnerability in guacamole-server (DEBIAN-CVE-2020-9497)

Summary

Vulnerability in guacamole-server (DEBIAN-CVE-2020-9497). Confidential information can be exposed externally. Mitigation: upgrade to 1.3.0-1 or later.

Original description

The description as published by the source.

Apache Guacamole 1.1.0 and older do not properly validate datareceived from RDP servers via static virtual channels. If a userconnects to a malicious or compromised RDP server, specially-craftedPDUs could result in disclosure of information within the memory ofthe guacd process handling the connection.

Source: OSV.dev (Open Source Vulnerabilities) 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 DEBIAN-CVE-2020-9497 has been found in guacamole-server.
Confidential information can be exposed externally.
What to do: upgrade guacamole-server to 1.3.0-1 or later.
If unsure, ask your IT team or search "guacamole-server DEBIAN-CVE-2020-9497" on the vendor's site.

DEBIAN-CVE-2020-9497 (guacamole-server)
Attack vector: local
Patched: 1.3.0-1 — 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.

❓ What is the problem

A vulnerability (unclassified) exists in guacamole-server.

📍 Affected scope

Check the vendor advisory for the affected versions of guacamole-server.

🔥 Severity

Severity: ?. Confidential information can be exposed externally.

🔧 How to fix

Update to 1.3.0-1.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'guacamole-server' . 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

1
Identify exposure identify
```
grep -r 'guacamole-server' . | 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 guacamole-server を grep し、稼働しているサービス・バージョンを把握する。
2
Apply patch patch
```
Upgrade guacamole-server to 1.3.0-1
```
ステージング環境で 1.3.0-1 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。
3
Post-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

Debian:11 guacamole-server

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.0-1"}]}]

References

advisory security-tracker.debian.org