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  5. CVE-2017-7549

CVE-2017-7549: Improper Link Resolution Before File Access

September 21, 2017 (updated January 5, 2018)

A flaw was found in instack-undercloud where pre-install and security policy scripts used insecure temporary files. A local user could exploit this flaw to conduct a symbolic-link attack, allowing them to overwrite the contents of arbitrary files.

References

  • www.securityfocus.com/bid/100407
  • bugzilla.redhat.com/show_bug.cgi?id=1477403
  • nvd.nist.gov/vuln/detail/CVE-2017-7549

Code Behaviors & Features

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Affected versions

Version 5.3.0, version 6.1.0, version 7.2.0

Fixed versions

  • 5.3.1
  • 6.1.1
  • 7.3.0

Solution

Upgrade to versions 5.3.1, 6.1.1, 7.3.0 or above.

Impact 6.4 MEDIUM

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N

Learn more about CVSS

Weakness

  • CWE-59: Improper Link Resolution Before File Access ('Link Following')

Source file

pypi/instack-undercloud/CVE-2017-7549.yml

Spotted a mistake? Edit the file on GitLab.

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