CVE-2017-5539

Description

The patch for directory traversal (CVE-2017-5480) in b2evolution version 6.8.4-stable has a bypass vulnerability. An attacker can use ..\/ to bypass the filter rule. Then, this attacker can exploit this vulnerability to delete or read any files on the server. It can also be used to determine whether a file exists.

Category

9.1
CVSS
Severity: Critical
CVSS 3.0 •
CVSS 2.0 •
EPSS 7.45% Top 10%
Vendor Advisory b2evolution.net
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/b2evolution/b2evolution/commit/e35f7c195d8c1103d2d981a48cda5ab45ecac48a issue tracking third party advisory patch
http://b2evolution.net/downloads/6-8-5 patch vendor advisory
http://www.securityfocus.com/bid/95700 vdb entry third party advisory
https://github.com/b2evolution/b2evolution/issues/36 issue tracking third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2017-5539?
CVE-2017-5539 has been scored as a critical severity vulnerability.
How to fix CVE-2017-5539?
To fix CVE-2017-5539, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-5539 being actively exploited in the wild?
It is possible that CVE-2017-5539 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~7% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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