CVE-2012-5373

Published: 28 November 2012

Oracle Java SE 7 and earlier, and OpenJDK 7 and earlier, 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 the MurmurHash3 algorithm, a different vulnerability than CVE-2012-2739.

Notes

no 2.3 update as of 2013/12/20. 2.4/armhf needs to be fixed
the MurmurHash3 was introduced in OpenJDK 7 7u9-2.3.3 and OpenJDK 6
6b24-1.11.5 as part of the fix for CVE-2012-2739.
icedtea-web not affected (code not present)
patches/security/20121016/7158800.patch introduced this (ie
murmur3_32())
per comment #1 in https://bugzilla.redhat.com/show_bug.cgi?id=880705
SipHash-2-4 is not vulnerable

purported to be fixed in 7u40

Status

References

• https://www.131002.net/data/talks/appsec12_slides.pdf
• https://bugzilla.redhat.com/show_bug.cgi?id=880705
• http://www.ocert.org/advisories/ocert-2012-001.html
• http://asfws12.files.wordpress.com/2012/11/asfws2012-jean_philippe_aumasson-martin_bosslet-hash_flooding_dos_reloaded.pdf
• http://2012.appsec-forum.ch/conferences/#c17
• http://mail.openjdk.java.net/pipermail/core-libs-dev/2012-May/010238.html
• http://icedtea.classpath.org/hg/release/icedtea6-1.11/file/d9564350faa6/patches/security/20121016/7158800.patch
• http://bugs.java.com/bugdatabase/view_bug.do?bug_id=8006593
• https://www.cve.org/CVERecord?id=CVE-2012-5373
• NVD
• Launchpad
• Debian

Bugs

• https://bugzilla.redhat.com/show_bug.cgi?id=750533
• https://bugzilla.redhat.com/show_bug.cgi?id=880713
• https://bugzilla.redhat.com/show_bug.cgi?id=880714