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CVE-2021-32635— Action Commands (run/shell/exec) Against Library URIs Ignore Configured Remote Endpoint

Quick assessment

Affected
sylabs singularity
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Singularity是Singularity 团队（Singularity）的一个开源的容器管理平台。该软件支持在其桌面上构建应用程序，并在任何公共云上或在计算边缘运行数百或数千个实例。 Singularity 3.7.2版本和3.7.3版本存在命令注入漏洞，该漏洞允许远程攻击者在目标系统上执行任意命令。

CVSS 6.3 · Medium EPSS 1.42% · P72
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I. Basic Information for CVE-2021-32635

Vulnerability Information
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Vulnerability Title
Action Commands (run/shell/exec) Against Library URIs Ignore Configured Remote Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
通信信道对预期端点的不适当限制
Source: CVE Program / CVE List V5
Vulnerability Title
Singularity 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Singularity是Singularity 团队（Singularity）的一个开源的容器管理平台。该软件支持在其桌面上构建应用程序，并在任何公共云上或在计算边缘运行数百或数千个实例。 Singularity 3.7.2版本和3.7.3版本存在命令注入漏洞，该漏洞允许远程攻击者在目标系统上执行任意命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
sylabs singularity >= 3.7.2, <= 3.7.3 -

II. Public POCs for CVE-2021-32635

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III. Intelligence Information for CVE-2021-32635

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Vendor Advisories for CVE-2021-32635 (2)

Other References for CVE-2021-32635 (1)

IV. Related Vulnerabilities

Same product: singularity
Same vendor: sylabs
Same weakness: CWE-923

V. Comments for CVE-2021-32635

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