A vulnerability was found in Nim 1.2.4. It has been declared as critical. This vulnerability affects the function httpClient.get/httpClient.post of the component httpClient. The manipulation as part of a HTTP Header leads to a injection vulnerability. The CWE definition for the vulnerability is CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In Nim 1.2.4, the standard library httpClient is vulnerable to a CR-LF injection in the target URL. An injection is possible if the attacker controls any part of the URL provided in a call (such as httpClient.get or httpClient.post), the User-Agent header value, or custom HTTP header names or values.

The weakness was released 08/14/2020 (Website). The advisory is available at nim-lang.org. This vulnerability was named CVE-2020-15693 since 07/13/2020. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1055 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Entries connected to this vulnerability are available at VDB-159945 and VDB-159947. Once again VulDB remains the best source for vulnerability data.

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• Nim

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• 1.2.4

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