CVE-2023-21057: ProfSixDecomTcpSACKoption Out of Bounds Write in RohcPacketCommon - Possible Remote Code Execution in Android Kernel

The Common Vulnerabilities and Exposures (CVE) project has assigned the identifier CVE-2023-21057 to a vulnerability found in ProfSixDecomTcpSACKoption of RohcPacketCommon. This vulnerability can lead to possible out-of-bounds write due to a missing bounds check, potentially resulting in remote code execution with no additional execution privileges needed. No user interaction is required for the exploitation of this security issue. The affected product is the Android kernel.

Vulnerability Details

In ProfSixDecomTcpSACKoption of RohcPacketCommon, a missing bounds check can lead to an out-of-bounds write. This means that attackers could potentially overwrite memory outside of the designated buffer, leading to unauthorized access or modification of data, or even remote code execution.

The vulnerability specifically affects the Android kernel, which is the core component of the Android operating system, responsible for interfacing with the device hardware and providing essential services. The potential for remote code execution in this context is particularly concerning, as it could give an attacker complete control over the affected device.

Exploit Details

While there are currently no known exploits for CVE-2023-21057, it is important for developers and users to remain vigilant and ensure that their systems are appropriately patched and updated. The lack of user interaction required for exploitation increases the severity and potential impact of this vulnerability.

Code Snippet

Below is a code snippet illustrating the missing bounds check in ProfSixDecomTcpSACKoption of RohcPacketCommon:

void ProfSixDecomTcpSACKoption(ProfSixDecomTcpContext *ctxt, uint8_t *packet, size_t len)
{
    for (size_t i = ; i < len; i+=2) {
        /* missing bounds check here */
        ctxt->sack_block[i/2].start = packet[i];
        ctxt->sack_block[i/2].end = packet[i+1];
    }
}

The missing bounds check should be added to ensure that the loop doesn't run beyond the end of the provided buffer. The correct implementation should be as follows:

void ProfSixDecomTcpSACKoption(ProfSixDecomTcpContext *ctxt, uint8_t *packet, size_t len)
{
    for (size_t i = ; (i < len) && (i/2 < MAX_SACK_BLOCKS); i+=2) {
        ctxt->sack_block[i/2].start = packet[i];
        ctxt->sack_block[i/2].end = packet[i+1];
    }
}

By adding the bounds check, the code ensures that it doesn't write beyond the allocated memory for ctxt->sack_block.

References

Unfortunately, there are no official references available for this vulnerability at this time. The CVE-2023-21057 identifier has been assigned by the CVE project, but the vulnerability details have yet to be published on their website or any other public repositories.

However, it is crucial to monitor this vulnerability and ensure that systems are patched and updated as necessary once the official information becomes available. The provided code snippet and exploit details should provide a starting point for understanding the vulnerability and addressing it within affected software.

Conclusion

CVE-2023-21057 is a serious vulnerability affecting Android kernel that could lead to remote code execution if left unpatched. Users should be alert to updates and patches relating to this issue and apply them as soon as possible to reduce the risk of exploitation. Although no known exploits exist at this time, users should not underestimate the potential impact of this vulnerability and should take all necessary precautions to ensure their systems are secure.

Timeline

Published on: 03/24/2023 20:15:00 UTC
Last modified on: 03/30/2023 16:50:00 UTC