Vulnerability in firefox (UBUNTU-CVE-2015-4000)

Summary

vulnerability in firefox (UBUNTU-CVE-2015-4000). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `39.0+build5-0ubuntu0.14.04.1` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **UBUNTU-CVE-2015-4000** has been found in firefox. Risk of unauthorized operations or information disclosure. CVSS score: ?/10. What to do: upgrade firefox to **39.0+build5-0ubuntu0.14.04.1** or later. If unsure, ask your IT team or search "firefox UBUNTU-CVE-2015-4000" on the vendor's site.

UBUNTU-CVE-2015-4000 (firefox) — Attack vector: remote (network-reachable) / unauthenticated / no user interaction Patched: `39.0+build5-0ubuntu0.14.04.1` — 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 firefox.

📍 Affected scope

firefox — .

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure

🔧 How to fix

Update to **39.0+build5-0ubuntu0.14.04.1**.

🛡️ 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 'firefox' .` 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

1
Identify exposure identify
```
grep -r 'firefox' . | 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 `firefox` を grep し、稼働しているサービス・バージョンを把握する。
6
Apply patch patch
```
Upgrade firefox to 39.0+build5-0ubuntu0.14.04.1
```
ステージング環境で 39.0+build5-0ubuntu0.14.04.1 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。
7
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 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

Ubuntu:14.04:LTS firefox

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"39.0+build5-0ubuntu0.14.04.1"}]}]

Ubuntu:14.04:LTS nss

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:3.19.2-0ubuntu0.14.04.1"}]}]

Ubuntu:14.04:LTS openjdk-6

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6b36-1.13.8-0ubuntu1~14.04"}]}]

Ubuntu:14.04:LTS openjdk-7

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7u79-2.5.6-0ubuntu1.14.04.1"}]}]

Ubuntu:14.04:LTS openssl

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.1f-1ubuntu2.12"}]}]

Ubuntu:14.04:LTS thunderbird

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:31.8.0+build1-0ubuntu0.14.04.1"}]}]

Ubuntu:16.04:LTS nss

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:3.19.2-1ubuntu1"}]}]

References

advisory https://ubuntu.com/security/notices/USN-2624-1
advisory https://ubuntu.com/security/notices/USN-2625-1
advisory https://ubuntu.com/security/notices/USN-2639-1
advisory https://ubuntu.com/security/notices/USN-2656-1
advisory https://ubuntu.com/security/notices/USN-2656-2
advisory https://ubuntu.com/security/notices/USN-2673-1
advisory https://ubuntu.com/security/notices/USN-2696-1
advisory https://ubuntu.com/security/notices/USN-2706-1
report https://ubuntu.com/security/CVE-2015-4000
report https://weakdh.org/imperfect-forward-secrecy.pdf
report https://weakdh.org/
report https://nohats.ca/wordpress/blog/2015/05/20/weakdh-and-ike-ipsec/
report https://www.openssl.org/blog/blog/2015/05/20/logjam-freak-upcoming-changes/
report http://lists.gnutls.org/pipermail/gnutls-devel/2015-May/007597.html
report https://access.redhat.com/articles/1456263
report https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/LogJam
report https://www.cve.org/CVERecord?id=CVE-2015-4000