CVE-2021-1145 : A vulnerability in the Secure FTP (SFTP) of Cisco StarOS for Cisco ASR 5000 Seri

A vulnerability in the Secure FTP (SFTP) of Cisco StarOS for Cisco ASR 5000 Series Routers could allow an authenticated, remote attacker to read arbitrary files on an affected device. To exploit this vulnerability, the attacker would need to have valid credentials on the affected device. The vulnerability is due to insecure handling of symbolic links. An attacker could exploit this vulnerability by sending a crafted SFTP command to an affected device. A successful exploit could allow the attacker to read arbitrary files on the affected device.

Published 2021-01-13 22:15:15

Updated 2021-01-20 17:29:04

Source Cisco Systems, Inc.

View at NVD, CVE.org

Products affected by CVE-2021-1145

Cisco » Staros
Versions before (<) 21.19.7
cpe:2.3:o:cisco:staros:*:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Asr 5000 » Version: N/A
When used together with: Cisco » Asr 5500 » Version: N/A
When used together with: Cisco » Asr 5700 » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2021-1145

EPSS FAQ

0.26%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 47 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-1145

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.0	MEDIUM	AV:N/AC:L/Au:S/C:P/I:N/A:N	8.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: Single Confidentiality Impact: Partial Integrity Impact: None Availability Impact: None
6.5	MEDIUM	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	2.8	3.6	Cisco Systems, Inc.
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: High Integrity: None Availability: None
6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	2.8	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: High Integrity: None Availability: None

CWE ids for CVE-2021-1145

CWE-59 Improper Link Resolution Before File Access ('Link Following')

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Assigned by: nvd@nist.gov (Primary)
CWE-61 UNIX Symbolic Link (Symlink) Following

The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.

Assigned by: ykramarz@cisco.com (Secondary)

References for CVE-2021-1145

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-staros-file-read-L3RDvtey

Cisco StarOS for Cisco ASR 5000 Series Routers Arbitrary File Read Vulnerability
Vendor Advisory

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Vulnerability Details : CVE-2021-1145

Products affected by CVE-2021-1145

Exploit prediction scoring system (EPSS) score for CVE-2021-1145

CVSS scores for CVE-2021-1145

CWE ids for CVE-2021-1145

References for CVE-2021-1145