Cisco Email Security Appliance 9.7.1-066 MIME Scanner 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, which was classified as critical, has been found in Cisco Email Security Appliance 9.7.1-066. This vulnerability affects unknown code of the component MIME Scanner. This manipulation causes input validation. This vulnerability is tracked as CVE-2017-3818. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Cisco Email Security Appliance 9.7.1-066 (Anti-Malware Software). Affected by this vulnerability is an unknown functionality of the component MIME Scanner. 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 Multipurpose Internet Mail Extensions (MIME) scanner of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA) could allow an unauthenticated, remote attacker to bypass configured user filters on the device, aka a Malformed MIME Header Filtering Bypass. 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. More Information: CSCvb65245. Known Affected Releases: 9.7.1-066. Known Fixed Releases: 9.8.0-092.

The bug was discovered 02/01/2017. The weakness was disclosed 02/03/2017 with Cisco as CSCvb65245 as confirmed advisory (Website). The advisory is shared at securityfocus.com. This vulnerability is known as CVE-2017-3818 since 12/21/2016. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 2 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 316073 (Cisco Email Security Appliance MIME Header Filtering Bypass Vulnerability (cisco-sa-20170201-esa1)).

Upgrading to version 9.8.0-092 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 95939†). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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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 Malformed MIME Header Filtering 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 9.8.0-092

Timelineinfo

12/21/2016 🔍
02/01/2017 +42 days 🔍
02/01/2017 +0 days 🔍
02/03/2017 +2 days 🔍
02/03/2017 +0 days 🔍
02/03/2017 +0 days 🔍
08/28/2024 +2763 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: CSCvb65245⛔
Organization: Cisco
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-3818 (🔍)
GCVE (CVE): GCVE-0-2017-3818
GCVE (VulDB): GCVE-100-96517
SecurityFocus: 95939 - Cisco Email Security Appliance for AsyncOS CVE-2017-3818 Remote Security Bypass Vulnerability
OSVDB: - CVE-2017-3818 - Cisco - AsyncOS - Security Bypass Issue
SecurityTracker: 1037773

Entryinfo

Created: 02/03/2017 17:01
Updated: 08/28/2024 14:35
Changes: 02/03/2017 17:01 (66), 08/10/2020 11:24 (7), 11/11/2022 14:08 (3), 08/28/2024 14:35 (16)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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