Cisco Email Security Appliance 9.7.1-066/9.7.1-HP2-207/9.8.5-085 Content Scanning Engine input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Cisco Email Security Appliance 9.7.1-066/9.7.1-HP2-207/9.8.5-085. This impacts an unknown function of the component Content Scanning Engine. This manipulation causes input validation. This vulnerability is registered as CVE-2017-3800. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Cisco Email Security Appliance 9.7.1-066/9.7.1-HP2-207/9.8.5-085 (Anti-Malware Software). Affected by this vulnerability is an unknown code of the component Content Scanning Engine. The manipulation with an unknown input leads to a input validation vulnerability. 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 confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability in the content scanning engine of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA) could allow an unauthenticated, remote attacker to bypass configured message or content filters on the device. Affected Products: This vulnerability affects all releases prior to the first fixed release of Cisco AsyncOS Software for Cisco Email Security Appliances, both virtual and hardware appliances, if the software is configured to apply a message filter or content filter to incoming email attachments. The vulnerability is not limited to any specific rules or actions for a message filter or content filter. More Information: CSCuz16076. Known Affected Releases: 9.7.1-066 9.7.1-HP2-207 9.8.5-085. Known Fixed Releases: 10.0.1-083 10.0.1-087.

The bug was discovered 01/18/2017. The weakness was published 01/26/2017 with Cisco as CSCuz16076 as confirmed advisory (Website). It is possible to read the advisory at securityfocus.com. This vulnerability is known as CVE-2017-3800 since 12/21/2016. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 8 days. During that time the estimated underground price was around $25k-$100k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316084 (Cisco Email Security Appliance Filter Bypass Vulnerability (cisco-sa-20170118-esa)).

Upgrading to version 10.0.1-083 or 10.0.1-087 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 95637†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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OpenVAS ID: 103403
OpenVAS Name: Cisco Email Security Appliance Filter Bypass Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Email Security Appliance 10.0.1-083/10.0.1-087

Timelineinfo

12/21/2016 🔍
01/18/2017 +28 days 🔍
01/18/2017 +0 days 🔍
01/26/2017 +8 days 🔍
01/26/2017 +0 days 🔍
01/26/2017 +0 days 🔍
05/14/2026 +3395 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: CSCuz16076⛔
Organization: Cisco
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-3800 (🔍)
GCVE (CVE): GCVE-0-2017-3800
GCVE (VulDB): GCVE-100-95995
SecurityFocus: 95637 - Cisco Email Security Appliance for AsyncOS CVE-2017-3800 Remote Security Bypass Vulnerability
OSVDB: - CVE-2017-3800 - Cisco - AsyncOS - Security Bypass Issue
SecurityTracker: 1037656

Entryinfo

Created: 01/26/2017 14:57
Updated: 05/14/2026 22:27
Changes: 01/26/2017 14:57 (66), 08/02/2020 09:33 (7), 11/04/2022 08:42 (3), 08/28/2024 19:30 (16), 05/14/2026 22:27 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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