CVE-2017-0903

high-risk

Published 2017-10-11

RubyGems versions between 2.0.0 and 2.6.13 are vulnerable to a possible remote code execution vulnerability. YAML deserialization of gem specifications can bypass class white lists. Specially crafted serialized objects can possibly be used to escalate to remote code execution.

Do I need to act?

5.5% chance of exploitation in next 30 days

EPSS score — moderate exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Fix available

Upgrade to: 510b1638ac9bba3ceb7a5d73135dafff9e5bab49

CVSS 9.8/10 Critical

NETWORK / LOW complexity

Affected Products (20)

Rubygems

Affected Vendors

Redhat Rubygems Debian Canonical

References (26)

Vendor Advisory http://blog.rubygems.org/2017/10/09/2.6.14-released.html

Vendor Advisory http://blog.rubygems.org/2017/10/09/unsafe-object-deserialization-vulnerability....

Third Party Advisory http://www.securityfocus.com/bid/101275

Third Party Advisory https://access.redhat.com/errata/RHSA-2017:3485

Third Party Advisory https://access.redhat.com/errata/RHSA-2018:0378

Third Party Advisory https://access.redhat.com/errata/RHSA-2018:0583

Third Party Advisory https://access.redhat.com/errata/RHSA-2018:0585

Patch https://github.com/rubygems/rubygems/commit/510b1638ac9bba3ceb7a5d73135dafff9e5b...

Third Party Advisory https://hackerone.com/reports/274990

Mailing List https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html

Third Party Advisory https://usn.ubuntu.com/3553-1/

Third Party Advisory https://usn.ubuntu.com/3685-1/

Third Party Advisory https://www.debian.org/security/2017/dsa-4031

Vendor Advisory http://blog.rubygems.org/2017/10/09/2.6.14-released.html

Vendor Advisory http://blog.rubygems.org/2017/10/09/unsafe-object-deserialization-vulnerability....

Third Party Advisory http://www.securityfocus.com/bid/101275

Third Party Advisory https://access.redhat.com/errata/RHSA-2017:3485

Third Party Advisory https://access.redhat.com/errata/RHSA-2018:0378

Third Party Advisory https://access.redhat.com/errata/RHSA-2018:0583

Third Party Advisory https://access.redhat.com/errata/RHSA-2018:0585

and 6 more references

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high-risk

Severity 32/34 · Critical

Exploitability 8/34 · Low

Exposure 29/34 · Critical