CVE-2012-4454

Published: 10 October 2012

openCryptoki before 2.4.1, when using spinlocks, allows local users to create or set world-writable permissions on arbitrary files via a symlink attack on the (1) .pkapi_xpk or (2) .pkcs11spinloc file in /tmp.

Notes

members of the pkcs11 group are considered trusted by upstream
and can escalate privileges to root even after the upstream
patches. See oss-security discussion.
Moving this to /var/lock/opencryptoki makes the problem worse
for members of the pkcs11 group as that directory wouldn't be
covered by symlink restrictions. Fix shouldn't be applied to
natty+
Fixing this in lucid would only prevent users who are not in
the pkcs11 group from escalating permissions. Since it is likely
that local users that have this installed are in that group,
this is downgraded to low.

Status

References

• http://www.openwall.com/lists/oss-security/2012/09/07/2
• http://www.openwall.com/lists/oss-security/2012/09/27/2
• https://www.cve.org/CVERecord?id=CVE-2012-4454
• NVD
• Launchpad
• Debian

Bugs

• http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=689417