An issue was discovered in Ruby 2.5.x through 2.5.7, 2.6.x through 2.6.5, and 2.7.0. If a victim calls BasicSocket#read_nonblock(requested_size, buffer, exception: false), the method resizes the buffer to fit the requested size, but no data is copied. Thus, the buffer string provides the previous value of the heap. This may expose possibly sensitive data from the interpreter.
Weakness
The product uses or accesses a resource that has not been initialized.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ruby | Ruby-lang | 2.5.0 (including) | 2.5.7 (including) |
| Ruby | Ruby-lang | 2.6.0 (including) | 2.6.5 (including) |
| Ruby | Ruby-lang | 2.7.0 (including) | 2.7.0 (including) |
| Red Hat Enterprise Linux 8 | RedHat | ruby:2.5-8040020200923213910.522a0ee4 | * |
| Red Hat Enterprise Linux 8 | RedHat | ruby:2.6-8040020210430142949.522a0ee4 | * |
| Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions | RedHat | ruby:2.6-8010020220201152941.c27ad7f8 | * |
| Red Hat Enterprise Linux 8.2 Extended Update Support | RedHat | ruby:2.6-8020020220201131207.4cda2c84 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | rh-ruby25-ruby-0:2.5.9-9.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | rh-ruby26-ruby-0:2.6.7-119.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | RedHat | rh-ruby25-ruby-0:2.5.9-9.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS | RedHat | rh-ruby25-ruby-0:2.5.9-9.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS | RedHat | rh-ruby26-ruby-0:2.6.7-119.el7 | * |
| Ruby1.9.1 | Ubuntu | trusty | * |
| Ruby2.0 | Ubuntu | trusty | * |
| Ruby2.5 | Ubuntu | bionic | * |
| Ruby2.5 | Ubuntu | eoan | * |
| Ruby2.5 | Ubuntu | esm-infra/bionic | * |
| Ruby2.7 | Ubuntu | esm-infra/focal | * |
| Ruby2.7 | Ubuntu | focal | * |
| Ruby2.7 | Ubuntu | upstream | * |
Potential Mitigations
References
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F4TNVTT66VPRMX5UZYSDGSVRXKKDDDU5/
- https://security.netapp.com/advisory/ntap-20200625-0001/
- https://www.debian.org/security/2020/dsa-4721
- https://www.ruby-lang.org/en/news/2020/03/31/heap-exposure-in-socket-cve-2020-10933/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F4TNVTT66VPRMX5UZYSDGSVRXKKDDDU5/
- https://security.netapp.com/advisory/ntap-20200625-0001/
- https://www.debian.org/security/2020/dsa-4721
- https://www.ruby-lang.org/en/news/2020/03/31/heap-exposure-in-socket-cve-2020-10933/