CVE-2018-8780: Path Traversal
Dir.open, Dir.new, Dir.entries and Dir.empty? accept the path of the target directory as their parameter. If the parameter contains NUL (\0) bytes, these methods recognize that the path is completed before the NUL bytes. So, if a script accepts an external input as the argument of these methods, the attacker can make the unintentional directory traversal.
Affected versions:
Ruby 2.2 series: 2.2.9 and earlier Ruby 2.3 series: 2.3.6 and earlier Ruby 2.4 series: 2.4.3 and earlier Ruby 2.5 series: 2.5.0 and earlier
External References:
https://www.ruby-lang.org/en/news/2018/03/28/poisoned-nul-byte-dir-cve-2018-8780/
Other sources
In Ruby before 2.2.10, 2.3.x before 2.3.7, 2.4.x before 2.4.4, 2.5.x before 2.5.1, and 2.6.0-preview1, the Dir.open, Dir.new, Dir.entries and Dir.empty? methods do not check NULL characters. When using the corresponding method, unintentional directory traversal may be performed.
— Launchpad
Ruby. Multiple issues in Ruby were addressed in this update.
Credit
Affected Software
Remediation
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
- CVE-2018-4295
- CVE-2018-4410
- CVE-2018-4417
- CVE-2017-12613
- CVE-2017-12618
- CVE-2018-4411
- CVE-2018-4308
- CVE-2018-4468
- CVE-2018-4126
- CVE-2018-4415
- CVE-2018-4398
- CVE-2018-4412
- CVE-2018-4153
- CVE-2018-4406
- CVE-2018-4346
- CVE-2018-4403
- CVE-2018-4423
- CVE-2018-3639
- CVE-2018-4342
- CVE-2018-4304
- CVE-2018-4426
- CVE-2018-4331
- CVE-2018-3646
- CVE-2018-4242
- CVE-2018-4394
- CVE-2018-4334
- CVE-2018-4396
- CVE-2018-4418
- CVE-2018-4350
- CVE-2018-4421
- CVE-2018-4422
- CVE-2018-4408
- CVE-2018-4402
- CVE-2018-4341
- CVE-2018-4354
- CVE-2018-4401
- CVE-2018-4371
- CVE-2018-4420
- CVE-2018-4399
- CVE-2018-4340
- CVE-2018-4419
- CVE-2018-4425
- CVE-2018-4259
- CVE-2018-4286
- CVE-2018-4287
- CVE-2018-4288
- CVE-2018-4291
- CVE-2018-4413
- CVE-2018-4407
- CVE-2018-4424
- CVE-2018-4187
- CVE-2018-4348
- CVE-2018-4389
- CVE-2018-4326
- CVE-2018-4310
- CVE-2018-3640
- CVE-2018-4369
- CVE-2018-6797
- CVE-2017-0898
- CVE-2017-10784
- CVE-2017-14033
- CVE-2017-14064
- CVE-2017-17405
- CVE-2017-17742
- CVE-2018-6914
- CVE-2018-8777
- CVE-2018-8778
- CVE-2018-8779
- CVE-2018-8780
- CVE-2018-4400
- CVE-2018-4395
- CVE-2018-4393
- CVE-2018-4203
- CVE-2018-4368
- CVE-2018-4470
- CVE-2018-4289
- CVE-2018-4268
- CVE-2018-4285
- CVE-2018-5383
- CVE-2018-4293
- CVE-2018-4269
- CVE-2018-4276
- CVE-2018-4178
- CVE-2018-4456
- CVE-2018-4283
- CVE-2018-3665
- CVE-2018-4280
- CVE-2018-4248
- CVE-2018-4277
- CVE-2018-6913
- CVE-2018-4274
Frequently Asked Questions
What is CVE-2018-8780?
CVE-2018-8780 is a vulnerability in Ruby that allows for unintended directory traversal.
What is the severity of CVE-2018-8780?
The severity of CVE-2018-8780 is critical with a CVSS score of 9.1.
Which versions of Ruby are affected by CVE-2018-8780?
Versions before 2.2.10, 2.3.x before 2.3.7, 2.4.x before 2.4.4, 2.5.x before 2.5.1, and 2.6.0-preview1 are affected by CVE-2018-8780.
How can I fix CVE-2018-8780?
To fix CVE-2018-8780, update Ruby to version 2.2.10, 2.3.7, 2.4.4, 2.5.1, or 2.6.0-preview1.
Where can I find more information about CVE-2018-8780?
You can find more information about CVE-2018-8780 at the following references: [Link 1](https://www.ruby-lang.org/en/news/2018/03/28/poisoned-nul-byte-dir-cve-2018-8780/), [Link 2](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1561957), [Link 3](https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=62989).