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UBUNTU-CVE-2020-8112
Vulnerability in ghostscript (UBUNTU-CVE-2020-8112)
Summary
vulnerability in ghostscript (UBUNTU-CVE-2020-8112). Successful exploitation can lead to full system takeover. Mitigation: upgrade to `9.26~dfsg+0-0ubuntu0.16.04.14` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **UBUNTU-CVE-2020-8112** has been found in ghostscript.
Successful exploitation can lead to full system takeover. CVSS score: ?/10.
What to do: upgrade ghostscript to **9.26~dfsg+0-0ubuntu0.16.04.14** or later.
If unsure, ask your IT team or search "ghostscript UBUNTU-CVE-2020-8112" on the vendor's site.
UBUNTU-CVE-2020-8112 (ghostscript) —
Attack vector: remote (network-reachable) / unauthenticated
Patched: `9.26~dfsg+0-0ubuntu0.16.04.14` — 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 ghostscript.
📍 Affected scope
ghostscript — .
🔥 Severity
Severity: ?. Successful exploitation can lead to full system takeover
🔧 How to fix
Update to **9.26~dfsg+0-0ubuntu0.16.04.14**.
🛡️ 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 'ghostscript' .` 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 'ghostscript' . | 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 `ghostscript` 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 ghostscript to 9.26~dfsg+0-0ubuntu0.16.04.14ステージング環境で 9.26~dfsg+0-0ubuntu0.16.04.14 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:16.04:LTS
ghostscript
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.26~dfsg+0-0ubuntu0.16.04.14"}]}]
Ubuntu:16.04:LTS
openjpeg2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.2-1.1+deb9u5build0.16.04.1"}]}]
Ubuntu:16.04:LTS
blender
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS
insighttoolkit4
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:16.04:LTS
texmaker
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS
ghostscript
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.26~dfsg+0-0ubuntu0.18.04.14"}]}]
Ubuntu:18.04:LTS
openjpeg2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.0-2+deb10u2build0.18.04.1"}]}]
Ubuntu:18.04:LTS
blender
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS
insighttoolkit4
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS
qtwebengine-opensource-src
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:18.04:LTS
texmaker
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS
openjpeg2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.1-1ubuntu4"}]}]
Ubuntu:20.04:LTS
blender
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS
insighttoolkit4
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS
qtwebengine-opensource-src
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS
texmaker
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS
blender
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS
insighttoolkit4
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS
qtwebengine-opensource-src
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS
texmaker
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS
blender
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS
qtwebengine-opensource-src
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS
texmaker
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10
blender
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10
qtwebengine-opensource-src
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10
texmaker
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS
blender
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS
qtwebengine-opensource-src
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS
texmaker
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:18.04:LTS
qtwebengine-opensource-src
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:18.04:LTS
texmaker
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:20.04:LTS
qtwebengine-opensource-src
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:20.04:LTS
texmaker
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:22.04:LTS
qtwebengine-opensource-src
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:22.04:LTS
texmaker
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:24.04:LTS
qtwebengine-opensource-src
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:24.04:LTS
texmaker
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:26.04:LTS
qtwebengine-opensource-src
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
References
- advisory https://ubuntu.com/security/notices/USN-4686-1
- advisory https://ubuntu.com/security/notices/USN-4497-1
- advisory https://ubuntu.com/security/notices/USN-5952-1
- report https://ubuntu.com/security/CVE-2020-8112
- report https://lists.debian.org/debian-lts-announce/2020/01/msg00035.html
- report https://www.cve.org/CVERecord?id=CVE-2020-8112