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 Deserialization of Untrusted Data vulnerability in owner command that can result in code execution. This attack appear to be exploitable via victim must run the gem owner command on a gem with a specially crafted YAML file. This vulnerability appears to have been fixed in 2.7.6.
The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Rubygems | Rubygems | * | 2.2.9 (including) |
| Red Hat Enterprise Linux 7 | RedHat | ruby-0:2.0.0.648-36.el7 | * |
| Red Hat Enterprise Linux 7.4 Advanced Update Support | RedHat | ruby-0:2.0.0.648-35.el7_4 | * |
| Red Hat Enterprise Linux 7.4 Telco Extended Update Support | RedHat | ruby-0:2.0.0.648-35.el7_4 | * |
| Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions | RedHat | ruby-0:2.0.0.648-35.el7_4 | * |
| Red Hat Enterprise Linux 7.5 Extended Update Support | RedHat | ruby-0:2.0.0.648-35.el7_5 | * |
| Red Hat Enterprise Linux 7.6 Extended Update Support | RedHat | ruby-0:2.0.0.648-36.el7_6 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | RedHat | rh-ruby23-ruby-0:2.3.8-69.el6 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | RedHat | rh-ruby24-ruby-0:2.4.5-91.el6 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | rh-ruby23-ruby-0:2.3.8-69.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | rh-ruby24-ruby-0:2.4.5-91.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | rh-ruby25-ruby-0:2.5.3-6.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS | RedHat | rh-ruby23-ruby-0:2.3.8-69.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS | RedHat | rh-ruby24-ruby-0:2.4.5-91.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS | RedHat | rh-ruby25-ruby-0:2.5.3-6.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | RedHat | rh-ruby23-ruby-0:2.3.8-69.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | RedHat | rh-ruby24-ruby-0:2.4.5-91.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | RedHat | rh-ruby25-ruby-0:2.5.3-6.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | RedHat | rh-ruby23-ruby-0:2.3.8-69.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | RedHat | rh-ruby24-ruby-0:2.4.5-91.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | RedHat | rh-ruby25-ruby-0:2.5.3-6.el7 | * |
| Jruby | Ubuntu | artful | * |
| Jruby | Ubuntu | bionic | * |
| Jruby | Ubuntu | cosmic | * |
| Jruby | Ubuntu | trusty | * |
| Jruby | Ubuntu | trusty/esm | * |
| Jruby | Ubuntu | xenial | * |
| Ruby1.9.1 | Ubuntu | trusty | * |
| Ruby2.0 | Ubuntu | trusty | * |
| Ruby2.3 | Ubuntu | artful | * |
| Ruby2.3 | Ubuntu | xenial | * |
| Ruby2.5 | Ubuntu | bionic | * |
| Ruby2.5 | Ubuntu | cosmic | * |
| Ruby2.5 | Ubuntu | disco | * |
| Ruby2.5 | Ubuntu | eoan | * |
It is often convenient to serialize objects for communication or to save them for later use. However, deserialized data or code can often be modified without using the provided accessor functions if it does not use cryptography to protect itself. Furthermore, any cryptography would still be client-side security – which is a dangerous security assumption. Data that is untrusted can not be trusted to be well-formed. When developers place no restrictions on “gadget chains,” or series of instances and method invocations that can self-execute during the deserialization process (i.e., before the object is returned to the caller), it is sometimes possible for attackers to leverage them to perform unauthorized actions, like generating a shell.