Vulnerability CVE-2021-21373

Vulnerability Name:

CVE-2021-21373 (CCN-198947)

Assigned:

2020-12-22

Published:

2021-03-26

Updated:

2021-03-31

Summary:

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.

CVSS v3 Severity:

5.9 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N)
5.2 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): High Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): High Availibility (A): None

7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:L)
6.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:L/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): High Privileges Required (PR): None User Interaction (UI): Required
Scope:	Scope (S): Changed
Impact Metrics:	Confidentiality (C): Low Integrity (I): High Availibility (A): Low

CVSS v2 Severity:

4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Medium Authentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): Partial Availibility (A): None

6.1 Medium (CCN CVSS v2 Vector: AV:N/AC:H/Au:S/C:P/I:C/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): High Athentication (Au): Single_Instance
Impact Metrics:	Confidentiality (C): Partial Integrity (I): Complete Availibility (A): Partial

Vulnerability Type:

CWE-295
CWE-348

Vulnerability Consequences:

Gain Access

References:

Source: MITRE
Type: CNA
CVE-2021-21373

Source: MISC
Type: Exploit, Third Party Advisory
https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/

Source: XF
Type: UNKNOWN
nimlang-cve202121373-code-exec(198947)

Source: MISC
Type: Release Notes, Third Party Advisory
https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130

Source: CCN
Type: Nimble GIT Repository
Nimble falls back to insecure http url when fetching packages

Source: CONFIRM
Type: Third Party Advisory
https://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2021-21373

Vulnerable Configuration:

Configuration 1:

cpe:/a:nim-lang:nim:*:*:*:*:*:*:*:* (Version < 1.2.10)

OR cpe:/a:nim-lang:nim:*:*:*:*:*:*:*:* (Version >= 1.4.0 and < 1.4.4)

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.opensuse.security:def:428	P	Security update for nim (Important)	2022-08-27
oval:org.opensuse.security:def:113032	P	nim-1.2.12-1.7 on GA media (Moderate)	2022-01-17
oval:org.opensuse.security:def:106475	P	nim-1.2.12-1.7 on GA media (Moderate)	2021-10-01
oval:org.opensuse.security:def:11204	P	Security update for nim (Moderate)	2021-04-29
oval:org.opensuse.security:def:96472	P	Security update for nim (Moderate)	2021-04-29
oval:org.opensuse.security:def:103162	P	Security update for nim (Moderate)	2021-04-29
oval:org.opensuse.security:def:109819	P	Security update for nim (Moderate)	2021-04-29
oval:org.opensuse.security:def:111345	P	Security update for nim (Moderate)	2021-04-25

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