Improper Input Validation Affecting rubygem-psych package, versions <0:2.0.0-33.el7_4
Threat Intelligence
Snyk has a published code exploit for this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Improper Input Validation vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-RHEL7-RUBYGEMPSYCH-5202703
- published26 Jul 2021
- disclosed14 Dec 2017
Introduced: 14 Dec 2017
CVE-2017-17405 (opens in a new tab)How to fix?
Upgrade RHEL:7 rubygem-psych to version 0:2.0.0-33.el7_4 or higher.
This issue was patched in RHSA-2018:0378.
NVD Description
Note: Versions mentioned in the description apply only to the upstream rubygem-psych package and not the rubygem-psych package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
Ruby before 2.4.3 allows Net::FTP command injection. Net::FTP#get, getbinaryfile, gettextfile, put, putbinaryfile, and puttextfile use Kernel#open to open a local file. If the localfile argument starts with the "|" pipe character, the command following the pipe character is executed. The default value of localfile is File.basename(remotefile), so malicious FTP servers could cause arbitrary command execution.
References
- http://www.securityfocus.com/bid/102204
- https://www.ruby-lang.org/en/news/2017/12/14/net-ftp-command-injection-cve-2017-17405/
- https://www.ruby-lang.org/en/news/2017/12/14/ruby-2-4-3-released/
- https://access.redhat.com/security/cve/CVE-2017-17405
- https://www.debian.org/security/2018/dsa-4259
- https://www.exploit-db.com/exploits/43381/
- https://lists.debian.org/debian-lts-announce/2017/12/msg00024.html
- https://lists.debian.org/debian-lts-announce/2017/12/msg00025.html
- https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
- https://access.redhat.com/errata/RHSA-2018:0378
- http://www.securitytracker.com/id/1042004
- https://www.exploit-db.com/exploits/43381