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ubuntucveUbuntu.comUB:CVE-2019-16782
HistoryDec 18, 2019 - 12:00 a.m.

CVE-2019-16782

2019-12-1800:00:00
ubuntu.com
ubuntu.com
11

5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

4.3 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:M/Au:N/C:P/I:N/A:N

0.003 Low

EPSS

Percentile

64.5%

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.

Bugs

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchruby-rack< 1.6.4-4ubuntu0.2+esm1UNKNOWN
ubuntu16.04noarchruby-rack< 1.6.4-3ubuntu0.2+esm1UNKNOWN
ubuntu14.04noarchruby-rack< 1.5.2-3+deb8u3ubuntu1~esm3) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu20.04noarchruby-rack< 2.0.7-2ubuntu0.1+esm1UNKNOWN

5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

4.3 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:M/Au:N/C:P/I:N/A:N

0.003 Low

EPSS

Percentile

64.5%

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