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UBUNTU-CVE-2023-48795

Vulnerability in openssh (UBUNTU-CVE-2023-48795)

Summary

vulnerability in openssh (UBUNTU-CVE-2023-48795). Data can be tampered with by attackers. Mitigation: upgrade to `2.0.11-0ubuntu1~16.04.4+esm1` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **UBUNTU-CVE-2023-48795** has been found in openssh. Data can be tampered with by attackers. CVSS score: ?/10. What to do: upgrade openssh to **2.0.11-0ubuntu1~16.04.4+esm1** or later. If unsure, ask your IT team or search "openssh UBUNTU-CVE-2023-48795" on the vendor's site.

UBUNTU-CVE-2023-48795 (openssh) — Attack vector: remote (network-reachable) / unauthenticated / no user interaction Patched: `2.0.11-0ubuntu1~16.04.4+esm1` — 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 openssh.

📍 Affected scope

openssh — .

🔥 Severity

Severity: ?. Data can be tampered with by attackers

🔧 How to fix

Update to **2.0.11-0ubuntu1~16.04.4+esm1**.

🛡️ 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 'openssh' .` 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 'openssh' . | 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 `openssh` 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 openssh to 2.0.11-0ubuntu1~16.04.4+esm1
```
ステージング環境で 2.0.11-0ubuntu1~16.04.4+esm1 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:Pro:14.04:LTS openssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:14.04:LTS paramiko

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:Pro:16.04:LTS lxd

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.11-0ubuntu1~16.04.4+esm1"}]}]

Ubuntu:Pro:16.04:LTS openssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:7.2p2-4ubuntu2.10+esm5"}]}]

Ubuntu:Pro:16.04:LTS golang-go.crypto

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:Pro:16.04:LTS paramiko

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:16.04:LTS dropbear

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:16.04:LTS proftpd-dfsg

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:16.04:LTS putty

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:16.04:LTS python-asyncssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:Pro:FIPS:16.04:LTS openssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:Pro:18.04:LTS lxd

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.3-0ubuntu1~18.04.2+esm1"}]}]

Ubuntu:Pro:18.04:LTS openssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:7.6p1-4ubuntu0.7+esm3"}]}]

Ubuntu:18.04:LTS paramiko

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:Pro:18.04:LTS dropbear

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2017.75-3ubuntu0.1~esm1"}]}]

Ubuntu:Pro:18.04:LTS golang-go.crypto

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:18.04:LTS openssh-ssh1

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:18.04:LTS proftpd-dfsg

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:18.04:LTS putty

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:Pro:18.04:LTS python-asyncssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:Pro:FIPS-updates:18.04:LTS openssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:7.9p1-10~ubuntu18.04.fips.0.9"}]}]

Ubuntu:Pro:FIPS:18.04:LTS openssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:20.04:LTS filezilla

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.46.3-1ubuntu0.1"}]}]

Ubuntu:20.04:LTS libssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.3-2ubuntu2.4"}]}]

Ubuntu:20.04:LTS openssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:8.2p1-4ubuntu0.10"}]}]

Ubuntu:20.04:LTS paramiko

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.0-2ubuntu0.3"}]}]

Ubuntu:20.04:LTS proftpd-dfsg

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.6c-2ubuntu0.1"}]}]

Ubuntu:20.04:LTS python-asyncssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.2-1ubuntu0.1"}]}]

Ubuntu:Pro:20.04:LTS dropbear

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2019.78-2ubuntu0.1~esm1"}]}]

Ubuntu:Pro:20.04:LTS golang-go.crypto

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:20.04:LTS openssh-ssh1

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:20.04:LTS putty

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:Pro:FIPS-updates:20.04:LTS openssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:8.2p1-4ubuntu0.fips.0.10"}]}]

Ubuntu:Pro:FIPS:20.04:LTS openssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:22.04:LTS dropbear

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2020.81-5ubuntu0.1"}]}]

Ubuntu:22.04:LTS filezilla

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.58.0-1ubuntu0.1"}]}]

Ubuntu:22.04:LTS libssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.6-2ubuntu0.22.04.2"}]}]

Ubuntu:22.04:LTS openssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:8.9p1-3ubuntu0.5"}]}]

Ubuntu:22.04:LTS openssh-ssh1

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:22.04:LTS paramiko

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.3-0ubuntu1.2"}]}]

Ubuntu:22.04:LTS putty

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:Pro:22.04:LTS golang-go.crypto

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:Pro:22.04:LTS python-asyncssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.5.0-1ubuntu0.1~esm1"}]}]

Ubuntu:24.04:LTS dropbear

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:24.04:LTS filezilla

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.66.4-1"}]}]

Ubuntu:24.04:LTS openssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.6p1-3ubuntu1"}]}]

Ubuntu:24.04:LTS openssh-ssh1

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:24.04:LTS paramiko

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.12.0-2ubuntu4"}]}]

Ubuntu:24.04:LTS putty

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:24.04:LTS python-asyncssh

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.10.1-2ubuntu0.1"}]}]

Ubuntu:Pro:24.04:LTS golang-go.crypto

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:25.10 dropbear

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:25.10 golang-go.crypto

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:25.10 openssh-ssh1

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:25.10 proftpd-dfsg

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:26.04:LTS dropbear

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:26.04:LTS golang-go.crypto

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:26.04:LTS openssh-ssh1

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:26.04:LTS proftpd-dfsg

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

References

advisory https://ubuntu.com/security/notices/USN-6560-1
advisory https://ubuntu.com/security/notices/USN-6561-1
advisory https://ubuntu.com/security/notices/USN-6560-2
advisory https://ubuntu.com/security/notices/USN-6585-1
advisory https://ubuntu.com/security/notices/USN-6589-1
advisory https://ubuntu.com/security/notices/USN-6598-1
advisory https://ubuntu.com/security/notices/USN-6738-1
advisory https://ubuntu.com/security/notices/USN-7051-1
advisory https://ubuntu.com/security/notices/USN-7297-1
advisory https://ubuntu.com/security/notices/USN-7292-1
report https://ubuntu.com/security/CVE-2023-48795
report https://terrapin-attack.com/
report https://www.openwall.com/lists/oss-security/2023/12/18/3
report https://github.com/ronf/asyncssh/security/advisories/GHSA-hfmc-7525-mj55
report https://www.cve.org/CVERecord?id=CVE-2023-48795

Summary

AI summary snake-internal / snake-material-v2

Response Actions (7 steps)

Affected packages

References

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