Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2018-1000073

Improper Link Resolution Before File Access ('Link Following')

Published: Mar 13, 2018 | Modified: Nov 21, 2024
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N
RedHat/V2
RedHat/V3
5.5 MODERATE
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Ubuntu
LOW
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2018-1000073
CWEhttps://cwe.mitre.org/data/definitions/59.html

RubyGems version 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, prior to trunk revision 62422 contains a Directory Traversal vulnerability in install_location function of package.rb that can result in path traversal when writing to a symlinked basedir outside of the root. This vulnerability appears to have been fixed in 2.7.6.

Weakness

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Affected Software

NameVendorStart VersionEnd Version
RubygemsRubygems*2.2.9 (including)
Red Hat Enterprise Linux 7RedHatruby-0:2.0.0.648-36.el7*
Red Hat Enterprise Linux 7.4 Advanced Update SupportRedHatruby-0:2.0.0.648-35.el7_4*
Red Hat Enterprise Linux 7.4 Telco Extended Update SupportRedHatruby-0:2.0.0.648-35.el7_4*
Red Hat Enterprise Linux 7.4 Update Services for SAP SolutionsRedHatruby-0:2.0.0.648-35.el7_4*
Red Hat Enterprise Linux 7.5 Extended Update SupportRedHatruby-0:2.0.0.648-35.el7_5*
Red Hat Enterprise Linux 7.6 Extended Update SupportRedHatruby-0:2.0.0.648-36.el7_6*
Red Hat Software Collections for Red Hat Enterprise Linux 6RedHatrh-ruby23-ruby-0:2.3.8-69.el6*
Red Hat Software Collections for Red Hat Enterprise Linux 6RedHatrh-ruby24-ruby-0:2.4.5-91.el6*
Red Hat Software Collections for Red Hat Enterprise Linux 7RedHatrh-ruby23-ruby-0:2.3.8-69.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7RedHatrh-ruby24-ruby-0:2.4.5-91.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7RedHatrh-ruby25-ruby-0:2.5.3-6.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUSRedHatrh-ruby23-ruby-0:2.3.8-69.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUSRedHatrh-ruby24-ruby-0:2.4.5-91.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUSRedHatrh-ruby25-ruby-0:2.5.3-6.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUSRedHatrh-ruby23-ruby-0:2.3.8-69.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUSRedHatrh-ruby24-ruby-0:2.4.5-91.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUSRedHatrh-ruby25-ruby-0:2.5.3-6.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUSRedHatrh-ruby23-ruby-0:2.3.8-69.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUSRedHatrh-ruby24-ruby-0:2.4.5-91.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUSRedHatrh-ruby25-ruby-0:2.5.3-6.el7*
JrubyUbuntuartful*
JrubyUbuntubionic*
JrubyUbuntucosmic*
JrubyUbuntudisco*
JrubyUbuntutrusty*
JrubyUbuntutrusty/esm*
JrubyUbuntuxenial*
Ruby2.0Ubuntutrusty*
Ruby2.3Ubuntuartful*
Ruby2.3Ubuntuesm-infra/xenial*
Ruby2.3Ubuntuxenial*
Ruby2.5Ubuntubionic*
Ruby2.5Ubuntuesm-infra/bionic*

Potential Mitigations

  • Follow the principle of least privilege when assigning access rights to entities in a software system.
  • Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

References

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