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CVE-2016-20012
medium
CVSS 5.3
Vulnerability in openbsd (CVE-2016-20012)
Summary
vulnerability in openbsd (CVE-2016-20012). Risk of unauthorized operations or information disclosure.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2016-20012** has been found in openbsd.
Risk of unauthorized operations or information disclosure. CVSS score: 5.3/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "openbsd CVE-2016-20012" on the vendor's site.
CVE-2016-20012 (openbsd) — CWE-203 / CVSS v3 5.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
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** (CWE-203) exists in openbsd.
📍 Affected scope
openbsd — .
🔥 Severity
Severity: Medium (CVSS 5.3/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to the patched release per vendor advisory.
🛡️ 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 'openbsd' .` 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
-
1Identify exposure identify
grep -r 'openbsd' . | 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 `openbsd` 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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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。
References
- advisory af854a3a-2127-422b-91ae-364da2661108
- exploit af854a3a-2127-422b-91ae-364da2661108
- web https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265
- web https://github.com/openssh/openssh-portable/pull/270
- web https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097
- web https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185
- web https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak
- web https://www.openwall.com/lists/oss-security/2018/08/24/1
- web https://nvd.nist.gov/vuln/detail/CVE-2016-20012
- web https://rushter.com/blog/public-ssh-keys
- web https://security.netapp.com/advisory/ntap-20211014-0005
- web https://github.com/advisories/GHSA-84j4-ccmw-hwpg