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CVE-2013-0263

22
FAUCET Score

CVE-2013-0263 affects Rack::Session::Cookie in various Rack versions, allowing remote attackers to guess session cookies. This vulnerability arises from a timing attack against an HMAC comparison function that lacks constant-time execution. With a CVSS score of 5.1, it presents a medium severity risk due to high attack complexity, but successful exploitation could lead to privilege escalation and arbitrary code execution. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.5.0CPE matchmatch criteria
cpe:2.3:a:rack_project:rack:1.5.0:*:*:*:*:*:*:*
1.5.1CPE matchmatch criteria
cpe:2.3:a:rack_project:rack:1.5.1:*:*:*:*:*:*:*
1.4.0CPE matchmatch criteria
cpe:2.3:a:rack_project:rack:1.4.0:*:*:*:*:*:*:*
1.4.1CPE matchmatch criteria
cpe:2.3:a:rack_project:rack:1.4.1:*:*:*:*:*:*:*
1.4.2CPE matchmatch criteria
cpe:2.3:a:rack_project:rack:1.4.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.1MEDIUM

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

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Exploitability Score
4.9
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
5.28%
Probability of exploitation in next 30 days
EPSS Percentile
91.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0528 is in the 90th percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (22)

redhatpatch availablevia redhat_api
Product: Red Hat Subscription Asset Manager 1.2Fixed in: thumbslug-0:0.0.28.1-1.el6_4
View patch
redhatpatch availablevia redhat_api
Product: RHEL 6 Version of OpenShift EnterpriseFixed in: jenkins-0:1.502-1.el6op
View patch
redhatpatch availablevia redhat_api
Product: RHEL 6 Version of OpenShift EnterpriseFixed in: openshift-origin-cartridge-jenkins-1.4-0:1.0.3-1.el6op
View patch
redhatpatch availablevia redhat_api
Product: RHEL 6 Version of OpenShift EnterpriseFixed in: ruby193-rubygem-rack-1:1.4.1-4.el6
View patch
redhatpatch availablevia redhat_api
Product: RHEL 6 Version of OpenShift EnterpriseFixed in: rubygem-rack-1:1.3.0-4.el6op
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Subscription Asset Manager 1.2Fixed in: candlepin-0:0.7.24-1.el6_3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Subscription Asset Manager 1.2Fixed in: katello-0:1.2.1.1-1h.el6_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Subscription Asset Manager 1.2Fixed in: katello-configure-0:1.2.3.1-4h.el6_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Subscription Asset Manager 1.2Fixed in: rubygem-actionpack-1:3.0.10-12.el6cf
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Subscription Asset Manager 1.2Fixed in: rubygem-activemodel-0:3.0.10-3.el6cf
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Subscription Asset Manager 1.2Fixed in: rubygem-delayed_job-0:2.1.4-3.el6cf
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Subscription Asset Manager 1.2Fixed in: rubygem-json-0:1.7.3-2.el6_3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Subscription Asset Manager 1.2Fixed in: rubygem-nokogiri-0:1.5.0-0.9.beta4.el6cf
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Subscription Asset Manager 1.2Fixed in: rubygem-rack-1:1.3.0-4.el6cf
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Subscription Asset Manager 1.2Fixed in: rubygem-rails_warden-0:0.5.5-2.el6cf
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Subscription Asset Manager 1.2Fixed in: rubygem-rdoc-0:3.8-6.el6cf
View patch
rubygemspatch availablevia ghsa
Product: rackFixed in: 1.5.2
rubygemspatch availablevia ghsa
Product: rackFixed in: 1.4.5
rubygemspatch availablevia ghsa
Product: rackFixed in: 1.3.10
rubygemspatch availablevia ghsa
Product: rackFixed in: 1.2.8
rubygemspatch availablevia ghsa
Product: rackFixed in: 1.1.6
redhatno patchvia redhat_api
Product: Red Hat Enterprise MRG 2Fixed in: rubygem-rack

Vendor Advisories (2)

rubygemsGHSA-xc85-32mf-xpv8medium

Rack arbitrary code execution via timing attack

May 5, 2022
redhatCVE-2013-0263Moderate

rubygem-rack: Timing attack in cookie sessions

Feb 8, 2013

References

lists.opensuse.org / opensuse-updates/2013-03/msg00048.html
rack.github.com
Vendor Advisory
rhn.redhat.com / errata/RHSA-2013-0686.html
bugzilla.redhat.com / show_bug.cgi
secunia.com / advisories/52033
Vendor Advisory
secunia.com / advisories/52134
Vendor Advisory
secunia.com / advisories/52774
gist.github.com / codahale/f9f3781f7b54985bee94
github.com / rack/rack/commit/0cd7e9aa397f8ebb3b8481d67dbac8b4863a7f07
github.com / rack/rack/commit/9a81b961457805f6d1a5c275d053068440421e11
groups.google.com / d/msg/rack-devel/xKrHVWeNvDM/4ZGA576CnK4J
groups.google.com / forum
groups.google.com / forum
groups.google.com / forum
groups.google.com / forum
puppet.com / security/cve/cve-2013-0263
twitter.com / coda/statuses/299732877745197056
debian.org / security/2013/dsa-2783
osvdb.org / 89939