CVE-2020-15693

Description

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.

Related CPE's

a nim-lang nim ********

References

https://nim-lang.org/blog/2020/07/30/versions-126-and-108-released.html

Release NotesThird Party Advisory

https://github.com/nim-lang/Nim/blob/dc5a40f3f39c6ea672e6dc6aca7f8118a69dda99/lib/pure/httpclient.nim#L1023

PatchThird Party Advisory

[oss-security] 20210204 [CVE-2020-15693, CVE-2020-15694] Nim - stdlib Httpclient - Header Crlf Injection & Server Response Validation

ExploitMailing ListThird Party Advisory

https://consensys.net/diligence/vulnerabilities/nim-httpclient-header-crlf-injection/

ExploitThird Party Advisory

CvssV3 impact

BaseSeverity	MEDIUM
ConfidentialityImpact	LOW
AttackComplexity	LOW
Scope	UNCHANGED
AttackVector	NETWORK
AvailabilityImpact	NONE
IntegrityImpact	LOW
PrivilegesRequired	NONE
BaseScore	6.5
VectorString	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Version	3.1
UserInteraction	NONE

CvssV2 impact

AccessComplexity	LOW
ConfidentialityImpact	PARTIAL
AvailabilityImpact	NONE
IntegrityImpact	PARTIAL
BaseScore	6.400000095367432
VectorString	AV:N/AC:L/Au:N/C:P/I:P/A:N
Version	2.0
AccessVector	NETWORK
Authentication	NONE

Created by Yello

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