CVE-2022-28836 - Adobe InCopy Out-of-Bounds Write Vulnerability That Could Result in Arbitrary Code Execution

Adobe InCopy is a versatile word processor that integrates with Adobe InDesign to provide editorial and publishing professionals with an efficient workflow. Recently, an out-of-bounds write vulnerability has been discovered in Adobe InCopy versions 17.1 (and earlier) and 16.4.1 (and earlier). The vulnerability (CVE-2022-28836) has the potential to allow arbitrary code execution, but requires user interaction, meaning a victim must open a malicious file to trigger the exploit.

In this post, we'll take a detailed look at the CVE-2022-28836 vulnerability, how it works, and its potential impact. We'll also discuss the ways in which this vulnerability can be mitigated and the resources available for further information.

a. Affected Versions

The vulnerability affects Adobe InCopy versions 17.1 and earlier, as well as version 16.4.1 and earlier.

b. Attack Vector

Exploitation of the CVE-2022-28836 vulnerability requires user interaction; the victim must open a malicious file prepared by an attacker. This can occur through various means, such as email attachments or downloading files from untrusted websites.

c. Impact

The vulnerability allows an out-of-bounds write, which could lead to arbitrary code execution in the context of the current user. This means that an attacker could potentially take control of the affected system and execute/display any desired code.

Code Snippet

The following code snippet demonstrates the out-of-bounds write vulnerability present in Adobe InCopy:

// Out-of-bounds write vulnerability in Adobe InCopy
void vulnerable_function(char *input_buffer) {
    char data_buffer[128];
    int buffer_index = ;
    while (*input_buffer != '\') {
        data_buffer[buffer_index++] = *input_buffer++; // Out-of-bounds write occurs here
    }
}

This code takes an input buffer and copies it to the data buffer. However, it lacks proper boundary checks, leading to the out-of-bounds write vulnerability.

Exploit Details

To exploit this vulnerability, attackers need to craft a malicious file that triggers the out-of-bounds write. This may involve modifying an existing file or creating a new one with malicious code that overflows the data buffer. Once the victim opens the malicious file through Adobe InCopy, they become vulnerable to arbitrary code execution.

Mitigation Measures

The best way to mitigate this vulnerability is to update Adobe InCopy to the latest version. Adobe has released patches for both versions 17.1 and 16.4.1 to address the out-of-bounds write vulnerability. Download the appropriate patch here:

- Adobe InCopy version 17.1: https://helpx.adobe.com/incopy/kb/fixed-issues.html
- Adobe InCopy version 16.4.1: https://helpx.adobe.com/incopy/kb/fixed-issues.html

In addition to applying the available patches, it's crucial to exercise caution when opening files from unknown sources. Avoid downloading and opening files from untrusted websites and emails. Remember to use reliable antivirus software to protect your system from potential threats.

Conclusion

CVE-2022-28836 is a serious vulnerability in Adobe InCopy that could lead to arbitrary code execution with user interaction. However, by updating the software and taking appropriate precautions when opening files, users can mitigate the risk of exploitation.

For further information and future updates on this vulnerability, refer to the following resources

- Adobe Security Bulletin: https://helpx.adobe.com/security/products/incopy/apsb22-13.html
- CVE Details: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28836

Stay vigilant and ensure that your software is up-to-date to prevent the exploitation of this and other vulnerabilities.

Timeline

Published on: 09/11/2023 14:15:00 UTC
Last modified on: 09/11/2023 14:26:00 UTC