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CVE-2023-4863
CISA KEV
high
[KEV] Out-of-Bounds Write in Google chromium-webp (CVE-2023-4863)
Summary
out-of-bounds write in Google chromium-webp (CVE-2023-4863). Successful exploitation can lead to full system takeover. Listed in CISA KEV — actively exploited.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2023-4863** has been found in Google chromium-webp.
Successful exploitation can lead to full system takeover. CVSS score: ?/10.
Note: CISA has officially confirmed this is **actively exploited in the wild**. Treat it with elevated urgency.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Google chromium-webp CVE-2023-4863" on the vendor's site.
CVE-2023-4863 (Google chromium-webp) — CWE-787 /
Attack vector: remote (network-reachable) / unauthenticated
Listed in CISA KEV — actively exploited, treat as top priority.
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
**out-of-bounds write** (CWE-787) exists in Google chromium-webp.
📍 Affected scope
Google chromium-webp — .
🔥 Severity
Severity: High. Successful exploitation can lead to full system takeover **Listed in CISA KEV** — actively exploited in the wild, treat as top priority.
🔧 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 'chromium-webp' .` 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
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1Identify exposure identify
grep -r 'chromium-webp' . | 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 `chromium-webp` 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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4Consider incident declaration escalate
Notify SOC / on-callCISA KEV登録済 = 実環境で悪用が観測されている。Step 3 で兆候があればインシデント対応宣言、無くてもパッチ適用までWAF強化を最優先で。
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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 NVD
- advisory https://lists.debian.org/debian-lts-announce/2023/09/msg00015.html
- advisory https://en.bandisoft.com/honeyview/history/
- advisory https://security.gentoo.org/glsa/202309-05
- advisory https://www.bentley.com/advisories/be-2023-0001/
- advisory https://lists.debian.org/debian-lts-announce/2023/09/msg00017.html
- advisory https://www.debian.org/security/2023/dsa-5498
- advisory https://adamcaudill.com/2023/09/14/whose-cve-is-it-anyway/
- advisory https://lists.debian.org/debian-lts-announce/2023/09/msg00016.html
- advisory https://www.mozilla.org/en-US/security/advisories/mfsa2023-40/
- advisory https://chromereleases.googleblog.com/2023/09/stable-channel-update-for-desktop_11.html
- advisory https://www.bleepingcomputer.com/news/google/google-fixes-another-chrome-zero-day-bug-exploited-in-attacks/
- advisory https://github.com/webmproject/libwebp/releases/tag/v1.3.2
- advisory https://security.gentoo.org/glsa/202401-10
- advisory https://security.netapp.com/advisory/ntap-20230929-0011/
- patch https://github.com/webmproject/libwebp/commit/902bc9190331343b2017211debcec8d2ab87e17a
- patch https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-4863
- report https://crbug.com/1479274
- report https://bugzilla.suse.com/show_bug.cgi?id=1215231
- report https://security-tracker.debian.org/tracker/CVE-2023-4863
- report https://blog.isosceles.com/the-webp-0day/
- report https://sethmlarson.dev/security-developer-in-residence-weekly-report-16
- report https://stackdiary.com/critical-vulnerability-in-webp-codec-cve-2023-4863/
- report https://www.vicarius.io/vsociety/posts/zero-day-webp-vulnerability-cve-2023-4863
- report https://news.ycombinator.com/item?id=37478403
- web https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4863
- web http://www.openwall.com/lists/oss-security/2023/09/22/1
- web http://www.openwall.com/lists/oss-security/2023/09/28/1
- web http://www.openwall.com/lists/oss-security/2023/09/28/2
- web http://www.openwall.com/lists/oss-security/2023/09/22/3
- web http://www.openwall.com/lists/oss-security/2023/09/22/5
- web http://www.openwall.com/lists/oss-security/2023/09/28/4
- web https://www.debian.org/security/2023/dsa-5497
- web https://lists.fedoraproject.org/archives/list/[email protected]/message/PYZV7TMKF4QHZ54SFJX54BDN52VHGGCX/
- web https://lists.fedoraproject.org/archives/list/[email protected]/message/WTRUIS3564P7ZLM2S2IH4Y4KZ327LI4I/
- web https://www.debian.org/security/2023/dsa-5496
- web https://lists.fedoraproject.org/archives/list/[email protected]/message/FYYKLG6CRGEDTNRBSU26EEWAO6D6U645/
- web https://lists.fedoraproject.org/archives/list/[email protected]/message/6T655QF7CQ3DYAMPFV7IECQYGDEUIVVT/
- web https://lists.fedoraproject.org/archives/list/[email protected]/message/WHOLML7N2G5KCAZXFWC5IDFFHSQS5SDB/
- web http://www.openwall.com/lists/oss-security/2023/09/22/4
- web http://www.openwall.com/lists/oss-security/2023/09/22/7
- web https://lists.fedoraproject.org/archives/list/[email protected]/message/KUQ7CTX3W372X3UY56VVNAHCH6H2F4X3/
- web http://www.openwall.com/lists/oss-security/2023/09/21/4
- web http://www.openwall.com/lists/oss-security/2023/09/22/6
- web http://www.openwall.com/lists/oss-security/2023/09/22/8
- web http://www.openwall.com/lists/oss-security/2023/09/26/1
- web http://www.openwall.com/lists/oss-security/2023/09/26/7
- web https://lists.fedoraproject.org/archives/list/[email protected]/message/OZDGWWMJREPAGKWCJKSCM4WYLANSKIFX/