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CVE-2021-21373

Date: March 26, 2021

Nimble is a package manager for the Nim programming language. In Nim release versions before versions 1.2.10 and 1.4.4, "nimble refresh" fetches a list of Nimble packages over HTTPS by default. In case of error it falls back to a non-TLS URL http://irclogs.nim-lang.org/packages.json. An attacker able to perform MitM can deliver a modified package list containing malicious software packages. If the packages are installed and used the attack escalates to untrusted code execution.

Severity Score

Related Resources (7)

https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130
https://security-tracker.debian.org/tracker/CVE-2021-21373
https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/
https://nvd.nist.gov/vuln/detail/CVE-2021-21373
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-21373
https://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8
https://www.mend.io/vulnerability-database/CVE-2021-21373

Severity Score

Weakness Type (CWE)

Improper Certificate Validation

CWE-295

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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