Cisco IOS XR ISO Image toctou

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Cisco IOS XR. Affected is an unknown function of the component ISO Image Handler. This manipulation causes toctou. The identification of this vulnerability is CVE-2023-20135. The attack can only be executed locally. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Cisco IOS XR (Router Operating System) (affected version not known). Affected by this vulnerability is some unknown functionality of the component ISO Image Handler. The manipulation with an unknown input leads to a toctou vulnerability. The CWE definition for the vulnerability is CWE-367. The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability in Cisco IOS XR Software image verification checks could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system. This vulnerability is due to a time-of-check, time-of-use (TOCTOU) race condition when an install query regarding an ISO image is performed during an install operation that uses an ISO image. An attacker could exploit this vulnerability by modifying an ISO image and then carrying out install requests in parallel. A successful exploit could allow the attacker to execute arbitrary code on an affected device.

The weakness was shared 09/14/2023 as cisco-sa-lnt-L9zOkBz5. The advisory is shared at sec.cloudapps.cisco.com. This vulnerability is known as CVE-2023-20135 since 10/27/2022. Neither technical details nor an exploit are publicly available.

Upgrading eliminates this vulnerability.

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Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 6.4
VulDB Temp Score: 6.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.0
NVD Vector: 🔍

CNA Base Score: 5.7
CNA Vector (Cisco Systems, Inc.): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Toctou
CWE: CWE-367 / CWE-362
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/27/2022 🔍
09/14/2023 +322 days 🔍
09/14/2023 +0 days 🔍
10/11/2023 +27 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-lnt-L9zOkBz5
Status: Confirmed

CVE: CVE-2023-20135 (🔍)
GCVE (CVE): GCVE-0-2023-20135
GCVE (VulDB): GCVE-100-239689
scip Labs: https://www.scip.ch/en/?labs.20150108

Entryinfo

Created: 09/14/2023 07:17
Updated: 10/11/2023 15:43
Changes: 09/14/2023 07:17 (49), 10/11/2023 15:43 (11)
Complete: 🔍
Cache ID: 216::103

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