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Zip Slip Vulnerability

KB ID: 2662
Product: Veeam Backup & Replication
Version: 8.x, 9.x
Published: 2018-06-06
Last Modified: 2026-10-28
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Veeam Software Security Commitment
Veeam® is committed to ensuring its products protect customers from potential risks. As part of that commitment, we operate a Vulnerability Disclosure Program (VDP) for all Veeam products and perform extensive internal code audits. When a vulnerability is identified, our team promptly develops a patch to address and mitigate the risk. In line with our dedication to transparency, we publicly disclose the vulnerability and provide detailed mitigation information. This approach ensures that all potentially affected customers can quickly implement the necessary measures to safeguard their systems. It’s important to note that once a vulnerability and its associated patch are disclosed, attackers will likely attempt to reverse-engineer the patch to exploit unpatched deployments of Veeam software. This reality underscores the critical importance of ensuring that all customers use the latest versions of our software and install all updates and patches without delay.

Challenge

Veeam is aware of the Zip Slip Vulnerability, which affects jobs with the guest file system indexing option enabled.

Zip Slip is an arbitrary file overwrite vulnerability in multiple ZIP decompression algorithm implementations that affects thousands of software products across many ecosystems. The vulnerability is exploited using a specially crafted zip archive that holds path traversal filenames. A path traversal filename is a malicious filename that when chained to the target extraction directory, results in the final path existing outside of the target folder . For instance, if a zip archive were to contain a file called "../../file.exe", it would break out of the target folder when extracted.

Cause

Zip library (DotNetZip) CVE-2018-1002205

Solution

This issue was fixed starting in Veeam Backup & Replication 9.5 U3a (build 9.5.0.1922).

If this KB article did not resolve your issue or you need further assistance with Veeam software, please create a Veeam Support Case.

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