CVE-2012-5371

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2012-11-28 · updated 2026-06-16
Weakness: CWE-310

Description

Ruby (aka CRuby) 1.9 before 1.9.3-p327 and 2.0 before r37575 computes hash values without properly restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table, as demonstrated by a universal multicollision attack against a variant of the MurmurHash2 algorithm, a different vulnerability than CVE-2011-4815.

Affected products

Ruby: through 1.9.3; 1.9, 1.9.1, 1.9.2, 1.9.3, 1.9.3-p0, 1.9.3-p125 (+2)

References

http://2012.appsec-forum.ch/conferences/#c17
http://asfws12.files.wordpress.com/2012/11/asfws2012-jean_philippe_aumasson-martin_bosslet-hash_flooding_dos_reloaded.pdf
http://secunia.com/advisories/51253
http://securitytracker.com/id?1027747
http://www.ocert.org/advisories/ocert-2012-001.html
http://www.osvdb.org/87280
http://www.ruby-lang.org/en/news/2012/11/09/ruby19-hashdos-cve-2012-5371/
http://www.securityfocus.com/bid/56484
http://www.ubuntu.com/usn/USN-1733-1
https://bugzilla.redhat.com/show_bug.cgi?id=875236
https://exchange.xforce.ibmcloud.com/vulnerabilities/79993
https://www.131002.net/data/talks/appsec12_slides.pdf

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