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CVE-2020-10933

Published: 4 May 2020

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.

Notes

AuthorNote
leosilva
vulnerable code introduced in 2.5.0

Priority

Low

Cvss 3 Severity Score

5.3

Score breakdown

Status

Package Release Status
ruby1.9.1
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

ruby2.0
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

ruby2.3
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream Needs triage

xenial Not vulnerable
(code not present)
ruby2.5
Launchpad, Ubuntu, Debian
bionic
Released (2.5.1-1ubuntu1.8)
eoan Ignored
(end of life)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

ruby2.7
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal
Released (2.7.0-5ubuntu1.3)
groovy Not vulnerable
(2.7.1-3ubuntu1.1)
trusty Does not exist

upstream
Released (2.7.1-1)
xenial Does not exist

Patches:
upstream: https://github.com/ruby/ruby/commit/61b7f86248bd121be2e83768be71ef289e8e5b90 (master)
upstream: https://github.com/ruby/ruby/commit/f832d957b837d5167058a3f8579d66e5b5d3472e (2.7)

Severity score breakdown

Parameter Value
Base score 5.3
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N