VDB-124843 · CVE-2018-0447 · BID 105300

Cisco Email Security Appliance Anti-Spam Protection Mechanism Messages access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.2$0-$5k0.00

Summaryinfo

A vulnerability was found in Cisco Email Security Appliance. It has been classified as critical. This issue affects some unknown processing of the component Anti-Spam Protection Mechanism. This manipulation as part of Messages causes access control. This vulnerability appears as CVE-2018-0447. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Cisco Email Security Appliance (Anti-Malware Software) (unknown version) and classified as critical. Affected by this vulnerability is an unknown code block of the component Anti-Spam Protection Mechanism. The manipulation as part of a Messages leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability in the anti-spam protection mechanisms of Cisco AsyncOS Software for the Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass certain content filters on an affected device. The vulnerability is due to incomplete input and validation checking mechanisms for certain Sender Policy Framework (SPF) messages that are sent to an affected device. An attacker could exploit this vulnerability by sending a customized SPF packet to an affected device. If successful, an exploit could allow the attacker to bypass the URL filters that are configured for the affected device, which could allow malicious URLs to pass through the device.

The bug was discovered 09/05/2018. The weakness was presented 10/05/2018 with Cisco as cisco-sa-20180905-esa-url-bypa as confirmed advisory (Website). It is possible to read the advisory at tools.cisco.com. This vulnerability is known as CVE-2018-0447 since 11/26/2017. 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 attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 30 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 316312 (Cisco Email Security Appliance URL Filtering Bypass Vulnerability(cisco-sa-20180905-esa-url-bypass)).

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 105300†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.2

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

NVD Base Score: 5.3
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
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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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

11/26/2017 🔍
09/05/2018 +282 days 🔍
09/05/2018 +0 days 🔍
10/05/2018 +29 days 🔍
10/05/2018 +0 days 🔍
10/06/2018 +1 days 🔍
05/22/2023 +1689 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-20180905-esa-url-bypa
Organization: Cisco
Status: Confirmed

CVE: CVE-2018-0447 (🔍)
GCVE (CVE): GCVE-0-2018-0447
GCVE (VulDB): GCVE-100-124843
SecurityFocus: 105300 - Cisco AsyncOS for Email Security Appliance CVE-2018-0447 Remote Security Bypass Vulnerability
SecurityTracker: 1041687

Entryinfo

Created: 10/06/2018 07:49
Updated: 05/22/2023 11:56
Changes: 10/06/2018 07:49 (64), 03/30/2020 09:41 (4), 05/22/2023 11:56 (4)
Complete: 🔍
Cache ID: 216::103

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

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