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CVE-2015-3206
high
CVSS 8.1
Authentication Bypass in pykerberos (CVE-2015-3206)
Summary
authentication bypass in pykerberos (CVE-2015-3206). Successful exploitation can lead to full system takeover. Mitigation: upgrade to `1.1.6` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2015-3206** has been found in pykerberos.
Successful exploitation can lead to full system takeover. CVSS score: 8.1/10.
What to do: upgrade pykerberos to **1.1.6** or later.
If unsure, ask your IT team or search "pykerberos CVE-2015-3206" on the vendor's site.
CVE-2015-3206 (pykerberos) — CWE-287 / CVSS v3 8.1
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: `1.1.6` — 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
**authentication bypass** (CWE-287) exists in pykerberos.
📍 Affected scope
pykerberos — .
🔥 Severity
Severity: High (CVSS 8.1/10). Successful exploitation can lead to full system takeover
🔧 How to fix
Update to **1.1.6**.
🛡️ 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 'pykerberos' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'pykerberos' . | 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 `pykerberos` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply patch patch
Upgrade pykerberos to 1.1.6ステージング環境で 1.1.6 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。
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7Post-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 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。
Affected packages
PyPI
pykerberos
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.6"}]}]
References
- advisory https://github.com/advisories/GHSA-mffc-9gx5-99g3
- report https://bugzilla.redhat.com/show_bug.cgi?id=1223802
- report https://github.com/apple/ccs-pykerberos/issues/31
- web http://www.openwall.com/lists/oss-security/2015/05/21/3
- web http://www.securityfocus.com/bid/74760
- web https://pypi.python.org/pypi/kerberos