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UBUNTU-CVE-2019-15903

Vulnerability in expat (UBUNTU-CVE-2019-15903)

Summary

vulnerability in expat (UBUNTU-CVE-2019-15903). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `2.1.0-4ubuntu1.4+esm2` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **UBUNTU-CVE-2019-15903** has been found in expat. Risk of unauthorized operations or information disclosure. CVSS score: ?/10. What to do: upgrade expat to **2.1.0-4ubuntu1.4+esm2** or later. If unsure, ask your IT team or search "expat UBUNTU-CVE-2019-15903" on the vendor's site.
UBUNTU-CVE-2019-15903 (expat) — Attack vector: remote (network-reachable) / unauthenticated / no user interaction Patched: `2.1.0-4ubuntu1.4+esm2` — 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 expat.
📍 Affected scope
expat — .
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **2.1.0-4ubuntu1.4+esm2**.
🛡️ 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 'expat' .` 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. 1
    Identify exposure identify 
    grep -r 'expat' . | 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 `expat` を grep し、稼働しているサービス・バージョンを把握する。

  2. 6
    Apply patch patch 
    Upgrade expat to 2.1.0-4ubuntu1.4+esm2

    ステージング環境で 2.1.0-4ubuntu1.4+esm2 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。

  3. 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:Pro:14.04:LTS expat
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0-4ubuntu1.4+esm2"}]}]
Ubuntu:Pro:14.04:LTS vtk
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.8.0-14.1ubuntu3+esm1"}]}]
Ubuntu:Pro:14.04:LTS coin3
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:14.04:LTS vnc4
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:14.04:LTS xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS chromium-browser
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"78.0.3904.70-0ubuntu0.16.04.2"}]}]
Ubuntu:16.04:LTS expat
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0-7ubuntu0.16.04.5"}]}]
Ubuntu:16.04:LTS firefox
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"70.0+build2-0ubuntu0.16.04.1"}]}]
Ubuntu:16.04:LTS thunderbird
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:68.7.0+build1-0ubuntu0.16.04.2"}]}]
Ubuntu:Pro:16.04:LTS libxmltok
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2-3ubuntu0.16.04.1~esm2"}]}]
Ubuntu:Pro:16.04:LTS vtk
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.1+dfsg-2.1ubuntu0.1~esm1"}]}]
Ubuntu:16.04:LTS ayttm
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS cableswig
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS cadaver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS coin3
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS insighttoolkit
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS insighttoolkit4
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS matanza
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS sitecopy
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS swish-e
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS tdom
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS vnc4
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS wbxml2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS chromium-browser
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"78.0.3904.70-0ubuntu0.18.04.2"}]}]
Ubuntu:18.04:LTS expat
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.5-3ubuntu0.2"}]}]
Ubuntu:18.04:LTS firefox
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"70.0+build2-0ubuntu0.18.04.1"}]}]
Ubuntu:18.04:LTS thunderbird
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:68.2.1+build1-0ubuntu0.18.04.1"}]}]
Ubuntu:18.04:LTS cadaver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:18.04:LTS coin3
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:18.04:LTS libxmltok
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2-4ubuntu0.18.04.1~esm4"}]}]
Ubuntu:18.04:LTS matanza
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS sitecopy
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:18.04:LTS swish-e
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS tdom
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS vnc4
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS wbxml2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS chromium-browser
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"78.0.3904.70-0ubuntu1"}]}]
Ubuntu:20.04:LTS firefox
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"70.0+build2-0ubuntu1"}]}]
Ubuntu:20.04:LTS cadaver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:20.04:LTS libxmltok
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2-4ubuntu0.20.04.1~esm4"}]}]
Ubuntu:20.04:LTS matanza
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS sitecopy
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:20.04:LTS swish-e
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS tdom
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS wbxml2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS cadaver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS matanza
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS sitecopy
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS tdom
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS wbxml2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:22.04:LTS libxmltok
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2-4ubuntu0.22.04.1~esm4"}]}]
Ubuntu:Pro:22.04:LTS swish-e
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS cadaver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS matanza
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS tdom
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS wbxml2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:24.04:LTS libxmltok
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2-4.1ubuntu2.24.0.4.1+esm2"}]}]
Ubuntu:Pro:24.04:LTS swish-e
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10 cadaver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10 matanza
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10 sitecopy
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10 swish-e
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10 tdom
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10 wbxml2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10 xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS cadaver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS matanza
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS sitecopy
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS tdom
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS wbxml2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:26.04:LTS swish-e
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:14.04:LTS xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS ayttm
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:18.04:LTS xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:20.04:LTS xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:22.04:LTS xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:24.04:LTS xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS cableswig
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

References

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