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UBUNTU-CVE-2022-25235
Vulnerability in expat (UBUNTU-CVE-2022-25235)
Summary
vulnerability in expat (UBUNTU-CVE-2022-25235). Successful exploitation can lead to full system takeover. Mitigation: upgrade to `2.1.0-4ubuntu1.4+esm4` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **UBUNTU-CVE-2022-25235** has been found in expat.
Successful exploitation can lead to full system takeover. CVSS score: ?/10.
What to do: upgrade expat to **2.1.0-4ubuntu1.4+esm4** or later.
If unsure, ask your IT team or search "expat UBUNTU-CVE-2022-25235" on the vendor's site.
UBUNTU-CVE-2022-25235 (expat) —
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: `2.1.0-4ubuntu1.4+esm4` — 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: ?. Successful exploitation can lead to full system takeover
🔧 How to fix
Update to **2.1.0-4ubuntu1.4+esm4**.
🛡️ 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
-
1Identify 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。
-
6Apply patch patch
Upgrade expat to 2.1.0-4ubuntu1.4+esm4ステージング環境で 2.1.0-4ubuntu1.4+esm4 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。
-
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
Ubuntu:Pro:14.04:LTS
expat
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0-4ubuntu1.4+esm4"}]}]
Ubuntu:Pro:14.04:LTS
coin3
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.4~abc9f50-4ubuntu2+esm2"}]}]
Ubuntu:Pro:14.04:LTS
vnc4
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:14.04:LTS
vtk
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:14.04:LTS
xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS
expat
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0-7ubuntu0.16.04.5+esm2"}]}]
Ubuntu:Pro:16.04:LTS
coin3
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.4~abc9f50+dfsg1-1ubuntu0.1~esm2"}]}]
Ubuntu:Pro:16.04:LTS
insighttoolkit
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.20.1+git20120521-6ubuntu0.1~esm1"}]}]
Ubuntu:Pro:16.04:LTS
libxmltok
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2-3ubuntu0.16.04.1~esm2"}]}]
Ubuntu:Pro:16.04:LTS
swish-e
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.7-4ubuntu0.1~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
insighttoolkit4
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS
matanza
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS
vnc4
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS
vtk
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS
xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS
expat
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.5-3ubuntu0.4"}]}]
Ubuntu:Pro:18.04:LTS
coin3
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.4~abc9f50+dfsg3-2ubuntu0.1~esm1"}]}]
Ubuntu:Pro:18.04:LTS
libxmltok
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2-4ubuntu0.18.04.1~esm1"}]}]
Ubuntu:18.04:LTS
matanza
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:18.04:LTS
swish-e
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.7-5ubuntu1+esm1"}]}]
Ubuntu:18.04:LTS
vnc4
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS
xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS
expat
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.9-1ubuntu0.2"}]}]
Ubuntu:Pro:20.04:LTS
libxmltok
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2-4ubuntu0.20.04.1~esm1"}]}]
Ubuntu:20.04:LTS
matanza
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:20.04:LTS
swish-e
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.7-6ubuntu0.1~esm1"}]}]
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
firefox
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1snap1-0ubuntu1"}]}]
Ubuntu:22.04:LTS
matanza
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS
thunderbird
[{"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~esm1"}]}]
Ubuntu:Pro:22.04:LTS
swish-e
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.7-6.1ubuntu0.1~esm1"}]}]
Ubuntu:24.04:LTS
libxmltok
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2-4.1ubuntu1"}]}]
Ubuntu:24.04:LTS
matanza
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS
thunderbird
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS
xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:24.04:LTS
swish-e
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.7-6.2ubuntu0.1~esm1"}]}]
Ubuntu:25.10
matanza
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10
swish-e
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10
thunderbird
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10
xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS
matanza
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS
thunderbird
[{"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"},{"fixed":"2.4.7-7.1ubuntu0.1~esm1"}]}]
Ubuntu:Pro:14.04:LTS
xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.33.06-0ubuntu1+esm1"}]}]
Ubuntu:Pro:16.04:LTS
ayttm
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.3-3ubuntu0.1~esm1"}]}]
Ubuntu:Pro:16.04:LTS
xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.33.14-1ubuntu1+esm1"}]}]
Ubuntu:Pro:18.04:LTS
xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.33.14-8ubuntu0.18.04.1~esm1"}]}]
Ubuntu:Pro:20.04:LTS
xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.33.14-8ubuntu0.20.04.1~esm1"}]}]
Ubuntu:Pro:22.04:LTS
xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.33.14-10ubuntu0.1~esm1"}]}]
Ubuntu:Pro:24.04:LTS
xmlrpc-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.33.14-12ubuntu0.1~esm1"}]}]
Ubuntu:Pro:16.04:LTS
cableswig
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.1.0+git20150808-2ubuntu0.1~esm1"}]}]
References
- advisory https://ubuntu.com/security/notices/USN-5288-1
- advisory https://ubuntu.com/security/notices/USN-5455-1
- advisory https://ubuntu.com/security/notices/USN-8240-1
- advisory https://ubuntu.com/security/notices/USN-8235-1
- advisory https://ubuntu.com/security/notices/USN-8313-1
- advisory https://ubuntu.com/security/notices/USN-8314-1
- advisory https://ubuntu.com/security/notices/USN-8316-1
- report https://ubuntu.com/security/CVE-2022-25235
- report https://github.com/libexpat/libexpat/pull/562
- report https://github.com/libexpat/libexpat/pull/562/commits/367ae600b48d74261bbc339b17e9318424049791
- report https://github.com/libexpat/libexpat/pull/562/commits/97cfdc3fa7dca759880d81e371901f4620279106
- report https://www.cve.org/CVERecord?id=CVE-2022-25235