crontab.c in crontab in FreeBSD and Apple Mac OS X allows local users to (1) determine the existence of arbitrary files via a symlink attack on a /tmp/crontab.XXXXXXXXXX temporary file and (2) perform MD5 checksum comparisons on arbitrary pairs of files via two symlink attacks on /tmp/crontab.XXXXXXXXXX temporary files.

References

• https://nvd.nist.gov/vuln/detail/CVE-2011-1073
• https://exchange.xforce.ibmcloud.com/vulnerabilities/65899
• http://marc.info/?l=full-disclosure&m=129891323028897&w=2
• http://openwall.com/lists/oss-security/2011/02/28/14
• http://openwall.com/lists/oss-security/2011/02/28/6
• http://securityreason.com/securityalert/8117
• http://www.securityfocus.com/archive/1/516716/100/0/threaded
• http://www.securityfocus.com/bid/46604