CVE-2020-15694

Description

In Nim 1.2.4, the standard library httpClient fails to properly validate the server response. For example, httpClient.get().contentLength() does not raise any error if a malicious server provides a negative Content-Length.

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#L241

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	HIGH
ConfidentialityImpact	NONE
AttackComplexity	LOW
Scope	UNCHANGED
AttackVector	NETWORK
AvailabilityImpact	NONE
IntegrityImpact	HIGH
PrivilegesRequired	NONE
BaseScore	7.5
VectorString	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Version	3.1
UserInteraction	NONE

CvssV2 impact

AccessComplexity	LOW
ConfidentialityImpact	NONE
AvailabilityImpact	NONE
IntegrityImpact	PARTIAL
BaseScore	5
VectorString	AV:N/AC:L/Au:N/C:N/I:P/A:N
Version	2.0
AccessVector	NETWORK
Authentication	NONE

Created by Yello

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