CVE-2019-16782

mediumpriority · track · 25EPSS 0.037 · 90 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

3.70% (90th) EPSS

CVSS 4.3 · medium

Is it mine?

31 products

Check your exposure

Who says so?

7 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-22

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixedansible-runner-0:1.4.6-1.el8ar.noarch as a component of CloudForms Management Engine 5.11redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 If the postgresql service is running, it will be automatically restarted after installing this update. After installing the updated packages, the httpd daemon will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:2480
Fixedansible-runner-0:1.4.6-1.el8ar.src as a component of CloudForms Management Engine 5.11redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 If the postgresql service is running, it will be automatically restarted after installing this update. After installing the updated packages, the httpd daemon will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:2480
Fixedcfme-0:5.11.6.0-1.el8cf.src as a component of CloudForms Management Engine 5.11redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 If the postgresql service is running, it will be automatically restarted after installing this update. After installing the updated packages, the httpd daemon will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:2480
Fixedcfme-0:5.11.6.0-1.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 If the postgresql service is running, it will be automatically restarted after installing this update. After installing the updated packages, the httpd daemon will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:2480
Fixedcfme-amazon-smartstate-0:5.11.6.0-1.el8cf.src as a component of CloudForms Management Engine 5.11redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 If the postgresql service is running, it will be automatically restarted after installing this update. After installing the updated packages, the httpd daemon will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:2480
Fixedcfme-amazon-smartstate-0:5.11.6.0-1.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 If the postgresql service is running, it will be automatically restarted after installing this update. After installing the updated packages, the httpd daemon will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:2480
Fixedcfme-appliance-0:5.11.6.0-1.el8cf.src as a component of CloudForms Management Engine 5.11redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 If the postgresql service is running, it will be automatically restarted after installing this update. After installing the updated packages, the httpd daemon will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:2480
Fixedcfme-appliance-0:5.11.6.0-1.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 If the postgresql service is running, it will be automatically restarted after installing this update. After installing the updated packages, the httpd daemon will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:2480
Fixedcfme-appliance-common-0:5.11.6.0-1.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 If the postgresql service is running, it will be automatically restarted after installing this update. After installing the updated packages, the httpd daemon will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:2480
Fixedcfme-appliance-tools-0:5.11.6.0-1.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 If the postgresql service is running, it will be automatically restarted after installing this update. After installing the updated packages, the httpd daemon will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:2480
Fixedcfme-gemset-0:5.11.6.0-1.el8cf.src as a component of CloudForms Management Engine 5.11redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 If the postgresql service is running, it will be automatically restarted after installing this update. After installing the updated packages, the httpd daemon will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:2480
Fixedcfme-gemset-0:5.11.6.0-1.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 If the postgresql service is running, it will be automatically restarted after installing this update. After installing the updated packages, the httpd daemon will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:2480
Fixedlibssh2-0:1.9.0-2.el8cf.src as a component of CloudForms Management Engine 5.11redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 If the postgresql service is running, it will be automatically restarted after installing this update. After installing the updated packages, the httpd daemon will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:2480
Fixedlibssh2-0:1.9.0-2.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 If the postgresql service is running, it will be automatically restarted after installing this update. After installing the updated packages, the httpd daemon will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:2480
Fixedlibssh2-debuginfo-0:1.9.0-2.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 If the postgresql service is running, it will be automatically restarted after installing this update. After installing the updated packages, the httpd daemon will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:2480
Fixedlibssh2-debugsource-0:1.9.0-2.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 If the postgresql service is running, it will be automatically restarted after installing this update. After installing the updated packages, the httpd daemon will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:2480
Fixedpython3-ansible-runner-0:1.4.6-1.el8ar.noarch as a component of CloudForms Management Engine 5.11redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 If the postgresql service is running, it will be automatically restarted after installing this update. After installing the updated packages, the httpd daemon will be restarted automatically.
https://access.redhat.com/errata/RHSA-2020:2480
Fixedruby4.0-rubygem-rack-2.2-0:2.2.22-1.1.aarch64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Fixedruby4.0-rubygem-rack-2.2-0:2.2.22-1.1.ppc64le as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Fixedruby4.0-rubygem-rack-2.2-0:2.2.22-1.1.s390x as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Fixedruby4.0-rubygem-rack-2.2-0:2.2.22-1.1.x86_64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Fixedruby4.0-rubygem-rack-0:3.1.18-1.3.aarch64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Fixedruby4.0-rubygem-rack-0:3.1.18-1.3.ppc64le as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Fixedruby4.0-rubygem-rack-0:3.1.18-1.3.s390x as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Fixedruby4.0-rubygem-rack-0:3.1.18-1.3.x86_64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Workaroundansible-runner-0:1.4.6-1.el8ar.noarch as a component of CloudForms Management Engine 5.11redhat_csaf
There is no mitigation for this issue, the flaw can only be resolved by applying updates.
Workaroundansible-runner-0:1.4.6-1.el8ar.src as a component of CloudForms Management Engine 5.11redhat_csaf
There is no mitigation for this issue, the flaw can only be resolved by applying updates.
Workaroundcfme-0:5.11.6.0-1.el8cf.src as a component of CloudForms Management Engine 5.11redhat_csaf
There is no mitigation for this issue, the flaw can only be resolved by applying updates.
Workaroundcfme-0:5.11.6.0-1.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
There is no mitigation for this issue, the flaw can only be resolved by applying updates.
Workaroundcfme-amazon-smartstate-0:5.11.6.0-1.el8cf.src as a component of CloudForms Management Engine 5.11redhat_csaf
There is no mitigation for this issue, the flaw can only be resolved by applying updates.
Workaroundcfme-amazon-smartstate-0:5.11.6.0-1.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
There is no mitigation for this issue, the flaw can only be resolved by applying updates.
Workaroundcfme-appliance-0:5.11.6.0-1.el8cf.src as a component of CloudForms Management Engine 5.11redhat_csaf
There is no mitigation for this issue, the flaw can only be resolved by applying updates.
Workaroundcfme-appliance-0:5.11.6.0-1.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
There is no mitigation for this issue, the flaw can only be resolved by applying updates.
Workaroundcfme-appliance-common-0:5.11.6.0-1.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
There is no mitigation for this issue, the flaw can only be resolved by applying updates.
Workaroundcfme-appliance-tools-0:5.11.6.0-1.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
There is no mitigation for this issue, the flaw can only be resolved by applying updates.
Workaroundcfme-gemset-0:5.11.6.0-1.el8cf.src as a component of CloudForms Management Engine 5.11redhat_csaf
There is no mitigation for this issue, the flaw can only be resolved by applying updates.
Workaroundcfme-gemset-0:5.11.6.0-1.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
There is no mitigation for this issue, the flaw can only be resolved by applying updates.
Workaroundlibssh2-0:1.9.0-2.el8cf.src as a component of CloudForms Management Engine 5.11redhat_csaf
There is no mitigation for this issue, the flaw can only be resolved by applying updates.
Workaroundlibssh2-0:1.9.0-2.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
There is no mitigation for this issue, the flaw can only be resolved by applying updates.
Workaroundlibssh2-debuginfo-0:1.9.0-2.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
There is no mitigation for this issue, the flaw can only be resolved by applying updates.
Workaroundlibssh2-debugsource-0:1.9.0-2.el8cf.x86_64 as a component of CloudForms Management Engine 5.11redhat_csaf
There is no mitigation for this issue, the flaw can only be resolved by applying updates.
Workaroundpython3-ansible-runner-0:1.4.6-1.el8ar.noarch as a component of CloudForms Management Engine 5.11redhat_csaf
There is no mitigation for this issue, the flaw can only be resolved by applying updates.

cvss

Technical severity, 0–10. One row per scoring source.

6.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.3mediumAV:N/AC:M/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 2.2 · impact 3.6

v3.16.3mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:Nsecondary · ENISA EU

v3.16.3mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:Nsecondary · security-advisories@github.comexploitability 1.8 · impact 4

v3.16.3mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:Nsecondary · OSV

v3.15.4mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.15.6mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:Lsecondary · SUSE Product Security

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · Red Hat Product Security US

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-203USprimaryCWE-200USCWE-203USCWE-208USCWE-208US

affected products (31)

Products and version ranges known to be affected.

Open Source Ruby on Rails <5.2.4.1all versionscert_bundDE
Open Source Ruby on Rails <6.0.2.1all versionscert_bundDE
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
SUSE openSUSEall versionscert_bundDEcpe:/o:suse:opensuse:-
Open Source Ruby on Rails< 5.2.4.1cert_bundDE
Open Source Ruby on Rails< 6.0.2.1cert_bundDE
rack rack≤ before 1.6.12 or 2.0.8enisa_euvdEU
fedoraproject fedora= 31nvdUScpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:*
opensuse leap= 15.1nvdUScpe:2.3:o:opensuse:leap:*:*:*:*:*:*:*:*
rack rack< 1.6.12nvdUScpe:2.3:a:rack:rack:*:*:*:*:*:*:*:*
rack rack2.0.0 → 2.0.8nvdUScpe:2.3:a:rack:rack:*:*:*:*:*:*:*:*
RubyGems rack< 1.6.12osvUSpkg:gem/rack
RubyGems rack2.0.0 → 2.0.8osvUSpkg:gem/rack
ansible-runner-0:1.4.6-1.el8ar.noarch as a component of CloudForms Management Engine 5.11all versionsfixedredhat_csafUS
ansible-runner-0:1.4.6-1.el8ar.src as a component of CloudForms Management Engine 5.11all versionsfixedredhat_csafUS
cfme-0:5.11.6.0-1.el8cf.src as a component of CloudForms Management Engine 5.11all versionsfixedredhat_csafUS
cfme-0:5.11.6.0-1.el8cf.x86_64 as a component of CloudForms Management Engine 5.11all versionsfixedredhat_csafUS
cfme-amazon-smartstate-0:5.11.6.0-1.el8cf.src as a component of CloudForms Management Engine 5.11all versionsfixedredhat_csafUS
cfme-amazon-smartstate-0:5.11.6.0-1.el8cf.x86_64 as a component of CloudForms Management Engine 5.11all versionsfixedredhat_csafUS

showing 20 of 31

advisories (5)

Vendor and ecosystem advisories describing this.

RHSA-2020:2480Red Hat Security Advisory: CloudForms 5.0.6 security, bug fix and enhancement update2020-06-10csaf · redhat_csafUS
An update is now available for CloudForms Management Engine 5.11. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
WID-SEC-W-2025-0383Ruby on Rails: Schwachstelle ermöglicht Offenlegung von InformationenDeutsch2019-12-18csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Ruby on Rails ausnutzen, um Informationen offenzulegen.
openSUSE-SU-2026:10286-1ruby4.0-rubygem-rack-2.2-2.2.22-1.1 on GA media2026-03-04csaf · suse_csafDE
ruby4.0-rubygem-rack-2.2-2.2.22-1.1 on GA media
openSUSE-SU-2026:10358-1ruby4.0-rubygem-rack-3.1.18-1.3 on GA media2026-03-13csaf · suse_csafDE
ruby4.0-rubygem-rack-3.1.18-1.3 on GA media
GHSA-hrqr-hxpp-chr3Possible Information Leak / Session Hijack Vulnerability in Rack2019-12-18ghsa · osvUS
There's a possible information leak / session hijack vulnerability in Rack. 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. ### Impact The session id stored in a cookie is the same id that is used when querying the backing session storage engine. Most storage mechanisms (for example a database) use some sort of indexing in order to speed up the lookup of that id. By carefully timing requests and session lookup failures, an attacker may be able to perform a timing attack to determine an existing session id and hijack that session. ## Releases The 1.6.12 and 2.0.8 releases are available at the normal locations. ### Workarounds There are no known workarounds. ### Patches To aid users who aren't able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a single changeset. * 1-6-session-timing-attack.patch - Patch for 1.6 series * 2-0-session-timing-attack.patch - Patch for 2.6 series ### Credits Thanks Will Leinweber for reporting this!

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd osv redhat_csaf suse_csaf NVD CVE.org MITRE

published 2019-12-18modified 2026-06-17

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+878 more

references (41)

External citations — patches, advisories, analysis.

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