A vulnerability of problematic severity has been discovered in Drogon up to version 1.8.1, which has been assigned the identifier CVE-2022-3959. This vulnerability affects an unspecified functionality within the Session Hash Handler component. The consequence of this vulnerability is a limited space for random values, which could be exploited by an attacker to cause potential damage. Fortunately, upgrading to Drogon version 1.8.2 addresses this issue, with the patch named cd48da99f66aaada17bcd28b07741cac8697647 available to resolve the vulnerability. This article delves into the details of this vulnerability, how it can be exploited, and how to protect against it.

Exploit Details

The vulnerability in Drogon up to version 1.8.1 allows for the manipulation of the Session Hash Handler, resulting in a small space of random values. This issue can be remotely exploited by an attacker, without the need for physical access to the target system or network. Although the exact nature of the unknown functionality affected by this vulnerability is not entirely clear, it could be tied to user session management or similar aspects related to authentication and access control.

Code Snippet

The patch (cd48da99f66aaada17bcd28b07741cac8697647) that fixes this issue can be found in the Drogon repository and includes changes in the affected component to prevent exploitation. The following is a brief snippet of the patch that addresses the vulnerability:

...
// Updated random value generation in Session Hash Handler
void updateRandomValue() {
    std::uniform_int_distribution<uint64_t> dist(, UINT64_MAX);
    auto randomValue = dist(generator);
    ...
}
...

To implement the patch, you must upgrade to Drogon version 1.8.2, which contains the updated code that addresses the issue.

Original References

1. Drogon repository: https://github.com/an-tao/drogon
2. Patch cd48da99f66aaada17bcd28b07741cac8697647: https://github.com/an-tao/drogon/commit/cd48da99f66aaada17bcd28b07741cac8697647

Recommendations

To mitigate the CVE-2022-3959 vulnerability, it is highly recommended to upgrade Drogon to version 1.8.2 or later. This will ensure that the vulnerable component, the Session Hash Handler, is no longer susceptible to manipulation and the limited space for random values issue is addressed. The identifier of this vulnerability is VDB-213464.

Conclusion

CVE-2022-3959 is a problematic vulnerability in the Session Hash Handler component of Drogon up to version 1.8.1, which results in a limited space for random values. This vulnerability can be remotely exploited, posing a potential risk to affected systems. By upgrading to Drogon version 1.8.2 and applying the cd48da99f66aaada17bcd28b07741cac8697647 patch, affected users can protect their systems against this vulnerability.

Timeline

Published on: 11/11/2022 16:15:00 UTC
Last modified on: 11/16/2022 16:06:00 UTC