CVE-2020-27853 : Security Advisory and Response
CVE-2020-27853 allows remote attackers to cause a denial of service or execute arbitrary code in Wire AVS and Wire Secure Messenger applications. Learn about the impact, affected versions, and mitigation steps.
Wire before 2020-10-16 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a format string. This affects Wire AVS (Audio, Video, and Signaling) 5.3 through 6.x before 6.4, the Wire Secure Messenger application before 3.49.918 for Android, and the Wire Secure Messenger application before 3.61 for iOS. This occurs via the value parameter to sdp_media_set_lattr in peerflow/sdp.c.
Understanding CVE-2020-27853
This CVE identifies a vulnerability in Wire that could lead to a denial of service or potential execution of arbitrary code.
What is CVE-2020-27853?
The CVE-2020-27853 vulnerability in Wire allows attackers to exploit a format string issue, potentially resulting in a denial of service or arbitrary code execution.
The Impact of CVE-2020-27853
The vulnerability could allow remote attackers to:
- Cause a denial of service by crashing the application
- Potentially execute arbitrary code on the affected systems
Technical Details of CVE-2020-27853
Wire before 2020-10-16 is susceptible to a format string vulnerability.
Vulnerability Description
The vulnerability allows remote attackers to exploit a format string, leading to a denial of service or potential execution of arbitrary code.
Affected Systems and Versions
- Wire AVS (Audio, Video, and Signaling) 5.3 through 6.x before 6.4
- Wire Secure Messenger application before 3.49.918 for Android
- Wire Secure Messenger application before 3.61 for iOS
Exploitation Mechanism
The vulnerability occurs via the value parameter to sdp_media_set_lattr in peerflow/sdp.c.
Mitigation and Prevention
It is crucial to take immediate steps to address and prevent the exploitation of CVE-2020-27853.
Immediate Steps to Take
- Update Wire AVS and Wire Secure Messenger applications to the latest versions
- Monitor for any unusual activities on the network
- Implement strict input validation mechanisms
Long-Term Security Practices
- Regularly update and patch all software and applications
- Conduct security training for employees to raise awareness of potential threats
Patching and Updates
- Apply patches provided by Wire promptly to address the vulnerability