In this post, we will analyze a newly discovered security vulnerability in drachtio-server .8.18, dubbed CVE-2022-45473. We will break down the exploit, examine the affected code snippet, and discuss its impact. We'll also provide links to original references and exploit details. Let's get started.
Overview
CVE-2022-45473 revolves around a security issue found in drachtio-server .8.18, a popular open-source SIP server written in C++. The vulnerability stems from the fact that the "/var/log/drachtio" directory and "drachtio.log" file have improper file permissions set.
Here's a summary of the vulnerability details
Affected Component: drachtio-server .8.18
Vulnerability: Improper file permissions
Impact: Information disclosure and potential privilege escalation
CVE Identifier: CVE-2022-45473
Exploit Details
The problem arises when drachtio-server .8.18 is installed, creating a directory "/var/log/drachtio" with mode 0777 and a log file "drachtio.log" with mode 0666. These file permissions enable any user on the system to access, write or even delete these crucial logs.
Here's a code snippet illustrating the improper file permissions
mkdir("/var/log/drachtio", 0777);
create("/var/log/drachtio/drachtio.log", 0666);
These permissions provide an attacker with an excellent opportunity to tamper with the logs, potentially covering their tracks or even launching further attacks by injecting malicious code. In essence, this exploit could lead to information disclosure and potential privilege escalation.
Original References
To better understand this vulnerability and the underlying code in drachtio-server .8.18, refer to the links below:
1. Drachtio-server GitHub Repository (https://github.com/davehorton/drachtio-server)
2. CVE-2022-45473 on the CVE List (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-45473)
Mitigation
Given that this vulnerability poses a significant security risk, it's essential to address it. Thankfully, correcting the file permissions is relatively straightforward. Users should update their system's file permissions to secure these files against unauthorized access.
For example, you can execute the following commands to modify the permissions
chmod 075 /var/log/drachtio
chmod 064 /var/log/drachtio/drachtio.log
These commands change the file permissions to allow only the owner and group members to interact with the directory and the log file. Additionally, ensure that future installations of drachtio-server apply the appropriate file permissions.
Conclusion
In this post, we've explored the security vulnerability CVE-2022-45473 in drachtio-server .8.18. We've examined the exploit details, code snippet, and original references. Lastly, we've discussed the mitigation steps required to secure the affected systems. As always, it's crucial to stay informed and up-to-date on security vulnerabilities to ensure the safety of your installations and data.
Timeline
Published on: 11/18/2022 18:15:00 UTC
Last modified on: 11/28/2022 22:12:00 UTC