VDB-106240 · CVE-2017-6795 · BID 100656

Cisco IOS XE on ASR 920 USB Modem File input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.4$5k-$25k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Cisco IOS XE on ASR 920. This affects an unknown part of the component USB Modem. Executing a manipulation can lead to input validation (File). This vulnerability is registered as CVE-2017-6795. The attack needs to be launched locally. No exploit is available.

Detailsinfo

A vulnerability has been found in Cisco IOS XE on ASR 920 (Router Operating System) (affected version unknown) and classified as problematic. This vulnerability affects an unknown functionality of the component USB Modem. The manipulation with an unknown input leads to a input validation vulnerability (File). The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect integrity, and availability. CVE summarizes:

A vulnerability in the USB-modem code of Cisco IOS XE Software running on Cisco ASR 920 Series Aggregation Services Routers could allow an authenticated, local attacker to overwrite arbitrary files on the underlying operating system of an affected device. The vulnerability is due to improper input validation of the platform usb modem command in the CLI of the affected software. An attacker could exploit this vulnerability by modifying the platform usb modem command in the CLI of an affected device. A successful exploit could allow the attacker to overwrite arbitrary files on the underlying operating system of an affected device. Cisco Bug IDs: CSCvf10783.

The bug was discovered 09/06/2017. The weakness was published 09/07/2017 as cisco-sa-20170906-asr920-2 as confirmed advisory (Website). The advisory is shared for download at tools.cisco.com. This vulnerability was named CVE-2017-6795 since 03/09/2017. The attack needs to be approached locally. The successful exploitation needs a single authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 01/11/2021).

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316164 (Cisco IOS XE Software for Cisco ASR 920 Series Routers Arbitrary File Overwrite Vulnerability (cisco-sa-20170906-asr920-2)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 100656†). Similar entry is available at VDB-106241. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.4

VulDB Base Score: 4.4
VulDB Temp Score: 4.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.4
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Name: File
Class: Input validation / File
CWE: CWE-20
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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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

03/09/2017 🔍
09/06/2017 +181 days 🔍
09/06/2017 +0 days 🔍
09/07/2017 +1 days 🔍
09/07/2017 +0 days 🔍
09/08/2017 +1 days 🔍
01/11/2021 +1221 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-20170906-asr920-2
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-6795 (🔍)
GCVE (CVE): GCVE-0-2017-6795
GCVE (VulDB): GCVE-100-106240
SecurityFocus: 100656 - Cisco ASR 920 Series Routers CVE-2017-6795 Local Arbitrary File Overwrite Vulnerability
SecurityTracker: 1039282

scip Labs: https://www.scip.ch/en/?labs.20150108
See also: 🔍

Entryinfo

Created: 09/08/2017 10:23
Updated: 01/11/2021 10:55
Changes: 09/08/2017 10:23 (61), 11/13/2019 17:50 (10), 01/11/2021 10:55 (3)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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