Vulnerability CVE-2021-29425
Published: 2021-04-13

Description:
In Apache Commons IO before 2.7, When invoking the method FileNameUtils.normalize with an improper input string, like "//../foo", or "\\..\foo", the result would be the same value, thus possibly providing access to files in the parent directory, but not further above (thus "limited" path traversal), if the calling code would use the result to construct a path value.

Type:

CWE-22

 (Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'))

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Apache -> Commons io 

 References:
https://issues.apache.org/jira/browse/IO-556
https://lists.apache.org/thread.html/rc359823b5500e9a9a2572678ddb8e01d3505a7ffcadfa8d13b8780ab%40%3Cuser.commons.apache.org%3E
https://lists.apache.org/thread.html/rfd01af05babc95b8949e6d8ea78d9834699e1b06981040dde419a330@%3Cdev.commons.apache.org%3E
https://lists.apache.org/thread.html/r8efcbabde973ea72f5e0933adc48ef1425db5cde850bf641b3993f31@%3Cdev.commons.apache.org%3E
https://lists.apache.org/thread.html/r873d5ddafc0a68fd999725e559776dc4971d1ab39c0f5cc81bd9bc04@%3Ccommits.pulsar.apache.org%3E
https://lists.apache.org/thread.html/r0d73e2071d1f1afe1a15da14c5b6feb2cf17e3871168d5a3c8451436@%3Ccommits.pulsar.apache.org%3E
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