Multiple vulnerabilities in Nim programming languag

1) Code Injection

EUVDB-ID: #VU52763

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-21372

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation in Nimble doCmd when processing entries in the packages.json package. A remote attacker can create a specially crafted entry in the packages.json file, trick the victim into loading the malicious package file and execute arbitrary code on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

nim: 1.2.0 - 1.4.2

External links

http://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/
http://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130
http://github.com/nim-lang/nimble/commit/7bd63d504a4157b8ed61a51af47fb086ee818c37
http://github.com/nim-lang/security/security/advisories/GHSA-rg9f-w24h-962p

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Cleartext transmission of sensitive information

EUVDB-ID: #VU52764

Risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-21373

CWE-ID: CWE-319 - Cleartext Transmission of Sensitive Information

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to "nimble refresh" tries to fetch a list of Nimble packages over HTTP connection in case HTTPS connection fails. A remote attacker can perform MitM attack and deliver a modified package list containing malicious software packages

Mitigation

Install updates from vendor's website.

Vulnerable software versions

nim: 1.2.0 - 1.4.2

External links

http://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/
http://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130
http://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Improper Certificate Validation

EUVDB-ID: #VU52765

Risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-21374

CWE-ID: CWE-295 - Improper Certificate Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to "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. A remote attacker can perform MitM attack and deliver a modified package list containing malicious software packages

Mitigation

Install updates from vendor's website.

Vulnerable software versions

nim: 1.2.0 - 1.4.2

External links

http://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/
http://github.com/nim-lang/Nim/pull/16940
http://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130
http://github.com/nim-lang/security/security/advisories/GHSA-c2wm-v66h-xhxx

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.