Vulnerability in github.com/sylabs/singularity (CVE-2021-32635)
Summary
Vulnerability in github.com/sylabs/singularity (CVE-2021-32635). Risk of unauthorized operations or information disclosure. Exploitable via singularity. Mitigation: upgrade to 3.7.4 or later.
Original description
The description as published by the source.
Singularity is an open source container platform. In verions 3.7.2 and 3.7.3, Dde to incorrect use of a default URL, singularity action commands (run/shell/exec) specifying a container using a library:// URI will always attempt to retrieve the container from the default remote endpoint (cloud.sylabs.io) rather than the configured remote endpoint. An attacker may be able to push a malicious container to the default remote endpoint with a URI that is identical to the URI used by a victim with a non-default remote endpoint, thus executing the malicious container. Only action commands (run/shell/exec) against library:// URIs are affected. Other commands such as pull / push respect the configured remote endpoint. The vulnerability is patched in Singularity version 3.7.4. Two possible workarounds exist: Users can only interact with the default remote endpoint, or an installation can have an execution control list configured to restrict execution to containers signed with specific secure keys.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2021-32635 has been found in github.com/sylabs/singularity.
Attackers can target a specific entry point like singularity over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade github.com/sylabs/singularity to 3.7.4 or later.
If unsure, ask your IT team or search "github.com/sylabs/singularity CVE-2021-32635" on the vendor's site.
CVE-2021-32635 (github.com/sylabs/singularity) — CWE-20
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: singularity / run / shell / exec
Patched: 3.7.4 — 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.
A vulnerability (CWE-20) exists in github.com/sylabs/singularity. Attackers reach the vulnerable code path via singularity without authentication.
Check the vendor advisory for the affected versions of github.com/sylabs/singularity. Attack surface: singularity / run / shell / exec.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 3.7.4.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'github.com/sylabs/singularity' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'github.com/sylabs/singularity' . | 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
github.com/sylabs/singularityを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade github.com/sylabs/singularity to 3.7.4ステージング環境で 3.7.4 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を含めること。
-
3Post-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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Ubuntu UBUNTU-CVE-2021-32635 singularity-container
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- advisory security.gentoo.org
- package github.com
- web github.com
- web github.com