Vulnerabilities > CVE-2017-9948 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Microsoft Skype 7.2/7.35/7.36
Attack vector
NETWORK Attack complexity
LOW Privileges required
LOW Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
A stack buffer overflow vulnerability has been discovered in Microsoft Skype 7.2, 7.35, and 7.36 before 7.37, involving MSFTEDIT.DLL mishandling of remote RDP clipboard content within the message box.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 3 |
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.
- Overflow Buffers Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
- Client-side Injection-induced Buffer Overflow This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
- Filter Failure through Buffer Overflow In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
- MIME Conversion An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.
Nessus
| NASL family | Windows |
| NASL id | SKYPE_7_37_0_103_CREDS.NASL |
| description | The version of Skype installed on the remote Windows host is 7.2.x, 7.35.x, or 7.36.x prior to 7.37. It is, therefore, affected by a stack buffer overflow condition in MSFTEDIT.DLL due to improper validation of images taken from the RDP session clipboard and which are pasted into the Skype message field when doing screen captures from an RDP client. An unauthenticated, remote attacker can exploit this to cause a denial of service condition or potentially the execution of arbitrary code. |
| last seen | 2020-06-01 |
| modified | 2020-06-02 |
| plugin id | 101084 |
| published | 2017-06-28 |
| 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/101084 |
| title | Skype 7.2.x / 7.35.x / 7.36.x < 7.37 MSFTEDIT.DLL RDP Session Clipboard Handling RCE |
The Hacker News
| id | THN:B9F68382816E57FBAEB475A6156D3110 |
| last seen | 2018-01-27 |
| modified | 2017-06-28 |
| published | 2017-06-27 |
| reporter | Mohit Kumar |
| source | https://thehackernews.com/2017/06/skype-crash-bug.html |
| title | Critical Skype Bug Lets Hackers Remotely Execute Malicious Code |
Vulner Lab
| id | VULNERLAB:2071 |
| last seen | 2019-07-10 |
| modified | 2017-06-26 |
| published | 2017-06-26 |
| reporter | Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (http://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.) |
| source | http://www.vulnerability-lab.com/get_content.php?id=2071 |
| title | Microsoft Skype v7.3.6 - Stack Overflow Vulnerability |