CVE-2019-16782

There's a possible information leak / session hijack vulnerability in Rack (RubyGem rack). This vulnerability is patched in versions 1.6.12 and 2.0.8. Attackers may be able to find and hijack sessions by using timing attacks targeting the session id. Session ids are usually stored and indexed in a database that uses some kind of scheme for speeding up lookups of that session id. By carefully measuring the amount of time it takes to look up a session, an attacker may be able to find a valid session id and hijack the session. The session id itself may be generated randomly, but the way the session is indexed by the backing store does not use a secure comparison.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
ruby-rack	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Not affected
	20.10 groovy	Not affected
	20.04 LTS focal	Fixed 2.0.7-2ubuntu0.1+esm1 Ubuntu Pro
	19.10 eoan	Ignored
	19.04 disco	Ignored
	18.04 LTS bionic	Fixed 1.6.4-4ubuntu0.2+esm1 Ubuntu Pro
	16.04 LTS xenial	Fixed 1.6.4-3ubuntu0.2+esm1 Ubuntu Pro
	14.04 LTS trusty	Fixed 1.5.2-3+deb8u3ubuntu1~esm3 Ubuntu Pro

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
ruby-rack	Upstream: 7fecaee

Severity score breakdown

Parameter	Value
Base score	5.9 · Medium
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

References

Related Ubuntu Security Notices (USN)

USN-5253-1
Rack vulnerabilities
13 December 2022