CVE-2015-4322 in Content Security Management Appliance
Summary
by MITRE
Cisco Content Security Management Appliance (SMA) 8.3.6-039, 9.1.0-31, and 9.1.0-103 improperly restricts the privileges available after LDAP authentication, which allows remote authenticated users to read or write to an arbitrary user's Spam Quarantine folder by visiting a spam-notification URL, aka Bug ID CSCuv65894.
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Analysis
by VulDB Data Team • 06/12/2022
The vulnerability identified as CVE-2015-4322 affects Cisco Content Security Management Appliances running specific versions of the software, namely 8.3.6-039, 9.1.0-31, and 9.1.0-103. This issue represents a critical privilege escalation flaw that undermines the security model of the appliance's authentication and authorization mechanisms. The vulnerability specifically targets the LDAP authentication process and demonstrates a failure in proper privilege management after successful authentication, creating a significant security gap that can be exploited by remote attackers.
The technical flaw manifests in how the appliance handles user privileges following LDAP authentication. When users authenticate through LDAP, the system fails to properly enforce access controls and privilege boundaries, allowing authenticated users to gain unauthorized access to other users' Spam Quarantine folders. This occurs through the manipulation of spam-notification URLs, which when visited by an authenticated user, trigger an authentication bypass mechanism that grants access to arbitrary user data. The vulnerability stems from inadequate input validation and privilege checking within the URL processing logic, creating a path for privilege escalation attacks.
The operational impact of this vulnerability is severe and multifaceted, affecting both data confidentiality and integrity within the email security infrastructure. Remote authenticated attackers can access sensitive email content stored in spam quarantine folders belonging to other users, potentially exposing personal information, business communications, or confidential data. The attack vector requires only a valid LDAP authentication credential and the ability to access spam notification URLs, making it particularly dangerous as it can be exploited by attackers who have gained access to legitimate user accounts through various means such as credential theft, phishing, or social engineering. This vulnerability effectively breaks the principle of least privilege and can lead to data breaches, privacy violations, and potential compliance violations.
Mitigation strategies for this vulnerability should include immediate deployment of Cisco's security patches and updates addressing the privilege escalation issue. Organizations should implement network segmentation to limit access to the Content Security Management Appliance and restrict LDAP authentication to trusted networks only. Additionally, monitoring and logging of access patterns to spam quarantine folders should be enhanced to detect suspicious activities. The vulnerability aligns with CWE-284, which describes improper access control, and can be mapped to ATT&CK technique T1078 for valid accounts and T1566 for credential harvesting. Organizations should also consider implementing multi-factor authentication for administrative access and regularly review user access permissions to minimize the impact of compromised credentials. Regular security assessments and vulnerability scanning should be conducted to identify similar privilege escalation issues within the email security infrastructure and other network components.