Vulnerability CVE-2019-1809


Published: 2019-05-15

Description:
A vulnerability in the Image Signature Verification feature of Cisco NX-OS Software could allow an authenticated, local attacker with administrator-level credentials to install a malicious software patch on an affected device. The vulnerability is due to improper verification of digital signatures for patch images. An attacker could exploit this vulnerability by crafting an unsigned software patch to bypass signature checks and loading it on an affected device. A successful exploit could allow the attacker to boot a malicious software patch image.

Type:

CWE-347

(Improper Verification of Cryptographic Signature)

Vendor: Cisco
Product: Nx-os 
Version:
8.3(0)cv(0.345)
8.3(0)cv(0.342)
8.1(1)s5
8.1(1)
8.1(0.59)s0
8.1(0.2)s0
8.1(0.112)s0
8.0(1)s2
7.3(2)n1(0.395)
7.3(2)n1(0.296)
7.3(0)zn(0.9)
7.3(0)zn(0.83)
7.3(0)zn(0.81)
7.3(0)n1(1)
7.2(1)n1(1)
7.2(0)zz(99.3)
7.2(0)zz(99.1)
7.2(0)n1(1)
7.2(0)n1(0.1)

CVSS2 => (AV:L/AC:L/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.6/10
6.4/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial

 References:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-nxos-psvb

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