Vulnerabilities > CVE-2017-4990 - Unrestricted Upload of File with Dangerous Type vulnerability in EMC Avamar Server
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
In EMC Avamar Server Software 7.4.1-58, 7.4.0-242, 7.3.1-125, 7.3.0-233, 7.3.0-226, an unauthorized attacker may leverage the file upload feature of the system maintenance page to load a maliciously crafted file to any directory which could allow the attacker to execute arbitrary code on the Avamar Server system.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 5 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Accessing Functionality Not Properly Constrained by ACLs In applications, particularly web applications, access to functionality is mitigated by the authorization framework, whose job it is to map ACLs to elements of the application's functionality; particularly URL's for web apps. In the case that the administrator failed to specify an ACL for a particular element, an attacker may be able to access it with impunity. An attacker with the ability to access functionality not properly constrained by ACLs can obtain sensitive information and possibly compromise the entire application. Such an attacker can access resources that must be available only to users at a higher privilege level, can access management sections of the application or can run queries for data that he is otherwise not supposed to.
- Privilege Abuse An adversary is able to exploit features of the target that should be reserved for privileged users or administrators but are exposed to use by lower or non-privileged accounts. Access to sensitive information and functionality must be controlled to ensure that only authorized users are able to access these resources. If access control mechanisms are absent or misconfigured, a user may be able to access resources that are intended only for higher level users. An adversary may be able to exploit this to utilize a less trusted account to gain information and perform activities reserved for more trusted accounts. This attack differs from privilege escalation and other privilege stealing attacks in that the adversary never actually escalates their privileges but instead is able to use a lesser degree of privilege to access resources that should be (but are not) reserved for higher privilege accounts. Likewise, the adversary does not exploit trust or subvert systems - all control functionality is working as configured but the configuration does not adequately protect sensitive resources at an appropriate level.
Nessus
| NASL family | Misc. |
| NASL id | EMC_AVAMAR_ESA-2017-054.NASL |
| description | According to its self-reported version number, the EMC Avamar Data Store (ADS) or Avamar Virtual Edition (AVE) software running on the remote host is 7.2.x prior to 7.2.1 Hotfix 277897 (7.2.1.32), 7.3.x prior to 7.3.1 Hotfix 276676 (7.3.1.125), or 7.4.x prior to 7.4.1 Hotfix 279294 (7.4.1.58). It is, therefore, affected by multiple vulnerabilities : - An authentication bypass vulnerability exists that allows an unauthenticated, remote attacker to bypass authentication and gain access to the system maintenance page. Note that this vulnerability does not affect the 7.4.x version branch. (CVE-2017-4989) - A remote code execution vulnerability exists in the file upload feature of the system maintenance page due to improper validation of file types and extensions of uploaded files before being placed in a user-accessible path. An unauthenticated, remote attacker can exploit this to upload a specially crafted file and then request it in order to execute arbitrary code. Note that this vulnerability does not affect the 7.2.x version branch. (CVE-2017-4990) |
| last seen | 2020-06-01 |
| modified | 2020-06-02 |
| plugin id | 101110 |
| published | 2017-06-29 |
| reporter | This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. |
| source | https://www.tenable.com/plugins/nessus/101110 |
| title | EMC Avamar ADS / AVE 7.2.x < 7.2.1 Hotfix 277897 / 7.3.x < 7.3.1 Hotfix 276676 / 7.4.x < 7.4.1 Hotfix 279294 Multiple Vulnerabilities (ESA-2017-054) |
| code | |