CVE-2021-21374
An attacker able to perform MitM can deliver a modified package list containing malicious software packages.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.04%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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 without full verification of the SSL/TLS certificate due to the default setting of httpClient. 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 3.1
- 8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.04% probability · 62th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-348, CWE-349, CWE-599, CWE-295
- Affected
- nim-lang/nim
- Source
- security-advisories@github.com
References
- https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/Exploit, Third Party Advisory
- https://github.com/nim-lang/Nim/pull/16940Patch, Third Party Advisory
- https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130Release Notes, Third Party Advisory
- https://github.com/nim-lang/security/security/advisories/GHSA-c2wm-v66h-xhxxThird Party Advisory
- https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/Exploit, Third Party Advisory
- https://github.com/nim-lang/Nim/pull/16940Patch, Third Party Advisory
- https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130Release Notes, Third Party Advisory
- https://github.com/nim-lang/security/security/advisories/GHSA-c2wm-v66h-xhxxThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.