CVE-2021-1961: Medium Vulnerability in Qualcomm Snapdragon Firmware

CVE-2021-1961 is classified as a medium-severity vulnerability with a CVSS score of 6.7. This vulnerability allows for a possible buffer overflow due to a lack of offset length check while updating the buffer value across various Qualcomm Snapdragon firmware components, including Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, and others. The risk to organizations includes potential unauthorized access to sensitive data and system resources as the attack can occur locally with high privileges.

As of now, there is no confirmed public exploit for this vulnerability, but the existence of a GitHub repository indicates that exploit code may be available. Organizations should prioritize patching immediately to mitigate the risk associated with this vulnerability.

Given the high impact on confidentiality, integrity, and availability, it is crucial for organizations to assess their current firmware versions against the affected products and take appropriate action.

Organizations are advised to monitor for any updates or advisories from Qualcomm and implement necessary patches as soon as they become available.

The urgency for defenders is further highlighted by the potential for exploitation, making it essential to schedule remediation as part of the organization's security strategy.

Vulnerability Details

The vulnerability is characterized by a buffer overflow scenario that arises in several Qualcomm Snapdragon firmware components due to insufficient length checking during buffer updates. The primary access vector is local, requiring high privileges, and it does not necessitate user interaction. The CVSS 3.1 vector string is CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H, denoting a medium severity level with significant impacts on confidentiality, integrity, and availability.

Technical Analysis

The root cause of CVE-2021-1961 is the lack of proper checks during the update of buffer values, leading to potential buffer overflows. The attack vector is classified as local, which means that an attacker must have physical access to the device or be able to execute code locally.

The attack complexity is low, and it requires high privileges, indicating that an attacker must already have significant access to the target device. User interaction is not required, making it easier for an attacker to exploit this vulnerability. The impacts on confidentiality, integrity, and availability are all categorized as high, signifying that successful exploitation could lead to unauthorized access and control over the affected devices.

Risk & Impact Analysis

The real-world deployment risk associated with CVE-2021-1961 is substantial, particularly for organizations utilizing Qualcomm's Snapdragon firmware in critical applications. The potential blast radius is significant, as various devices across different sectors could be affected. Organizations should consider the urgency of addressing this vulnerability, especially given the medium severity level indicated by the CVSS score and the existing exploit code available on GitHub.

Failure to patch could lead to unauthorized access and exploitation of sensitive information or device functionalities, emphasizing the need for immediate remediation efforts.

Exploitation Status

Affected Versions

The following Qualcomm Snapdragon firmware versions are affected by CVE-2021-1961: apq8009_firmware, apq8053_firmware, apq8096au_firmware, aqt1000_firmware, ar8031_firmware, ar8035_firmware, csra6620_firmware, csra6640_firmware, fsm10055_firmware, fsm10056_firmware, mdm9150_firmware, mdm9206_firmware, mdm9640_firmware, mdm9650_firmware, msm8953_firmware, msm8996au_firmware, qca6174a_firmware, qca6390_firmware, qca6391_firmware, qca6420_firmware, qca6421_firmware, qca6426_firmware, qca6430_firmware, qca6431_firmware, qca6436_firmware, qca6564a_firmware, qca6564au_firmware, qca6574_firmware, qca6574a_firmware, qca6574au_firmware, qca6584au_firmware, qca6595_firmware, qca6595au_firmware, qca6696_firmware, qca8337_firmware, qca9367_firmware, qca9377_firmware, qcm6125_firmware, qcs405_firmware, qcs410_firmware, qcs605_firmware, qcs610_firmware, qcs6125_firmware, qrb5165_firmware, qsm8250_firmware, qualcomm215_firmware, sa6145p_firmware, sa6150p_firmware, sa6155_firmware, sa6155p_firmware, sa8145p_firmware, sa8150p_firmware, sa8155_firmware, sa8155p_firmware, sa8195p_firmware.

Mitigation & Remediation

To mitigate the risks associated with CVE-2021-1961, organizations must apply patches provided by Qualcomm for the affected firmware versions. Regular monitoring for updates and the deployment of these updates should be prioritized.

Organizations may also consider implementing additional security measures, such as network segmentation and access controls, to reduce the attack surface and enhance defenses against potential exploitation.

For further assistance and security testing, organizations can utilize services like penetration testing to identify vulnerabilities and validate security postures.

Detection Guidance

Organizations should implement logging and monitoring to detect any unusual behavior associated with the exploitation of CVE-2021-1961. Key indicators may include unexpected system crashes, abnormal resource usage, and unauthorized access attempts.

AppSecure Threat Intelligence Insight

The long-term significance of CVE-2021-1961 lies in its representation of common security flaws in firmware across various devices. This vulnerability highlights the need for continuous security assessments and proactive vulnerability management strategies.

Organizations should take this opportunity to review their security policies and ensure that they are equipped to address similar vulnerabilities in the future.

For more insights into application security, organizations can refer to our detailed resources on vulnerability management and the importance of penetration testing methodologies in maintaining a robust security posture.