Vulnerabilities > CVE-2020-5821 - Injection vulnerability in Symantec Endpoint Protection
Attack vector
LOCAL Attack complexity
LOW Privileges required
NONE Confidentiality impact
PARTIAL Integrity impact
PARTIAL Availability impact
PARTIAL Summary
Symantec Endpoint Protection (SEP) and Symantec Endpoint Protection Small Business Edition (SEP SBE), prior to 14.2 RU2 MP1 and prior to 14.2.5569.2100 respectively, may be susceptible to a DLL injection vulnerability, which is a type of issue whereby an individual attempts to execute their own code in place of legitimate code as a means to perform an exploit.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 77 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Buffer Overflow via Environment Variables This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
- Server Side Include (SSI) Injection An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
- Cross Site Scripting through Log Files An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
- Command Line Execution through SQL Injection An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.
- Subverting Environment Variable Values The attacker directly or indirectly modifies environment variables used by or controlling the target software. The attacker's goal is to cause the target software to deviate from its expected operation in a manner that benefits the attacker.
Nessus
| NASL family | Windows |
| NASL id | SYMANTEC_ENDPOINT_PROT_CLIENT_SYMSA1505.NASL |
| description | The version of Symantec Endpoint Protection (SEP) Client installed on the remote host is 14.x prior to 14.2.5569.2100. It is, therefore, affected by multiple vulnerabilities: - A privilege escalation vulnerability exists. An unauthenticated, remote attacker can exploit this to compromise the software application to gain elevated access to resources that are normally protected from an application or user. (CVE-2020-5820, CVE-2020-5822, CVE-2020-5823) - A DLL injection vulnerability exists. An unauthenticated, local attacker can exploit this to execute their own code in place of legitimate code as a means to perform an exploit. (CVE-2020-5821) - A denial of service (DoS) vulnerability exists. An unauthenticated, remote attacker can exploit this issue to make the application stop responding.(CVE-2020-5824) - An arbitrary file write vulnerability exists. An unauthenticated, remote attacker can exploit this to overwrite existing files on the resident system without proper privileges. (CVE-2020-5825) - An out-of-bounds read error exists. An unauthenticated, remote attacker can exploit this to read memory outside of the bounds of the memory that had been allocated to the program. (CVE-2020-5826) Note that Nessus has not tested for this issue but has instead relied only on the application |
| last seen | 2020-03-18 |
| modified | 2020-02-13 |
| plugin id | 133675 |
| published | 2020-02-13 |
| reporter | This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. |
| source | https://www.tenable.com/plugins/nessus/133675 |
| title | Symantec Endpoint Protection Client 14.x < 14.2.5569.2100 Multiple Vulnerabilities (SYMSA1505) |
| code | |