FreeBSD kernel sys_dev_random information disclosure
| freebsd-sysdevrandom-information-disclosure (38764) |  Low Risk |
Description:
The FreeBSD kernel could allow a local attacker to obtain sensitive information, caused by a vulnerability in the sys_dev_random module. The random(4) and urandom(4) devices replay random data from previous reads. A local attacker could exploit this vulnerability to obtain fragments of values previously generated and other sensitive information.
Platforms Affected:
- FreeBSD, FreeBSD 5.5
- FreeBSD, FreeBSD 6.1
- FreeBSD, FreeBSD 6.2
- FreeBSD, FreeBSD
Remedy:
Refer to FreeBSD-SA-07:09.random for patch or upgrade information. See References.
Consequences:
Obtain Information
References:
- FreeBSD-SA-07:09.random , Random value disclosure at http://security.freebsd.org/advisories/FreeBSD-SA-07:09.random.asc.
- BID-26642: FreeBSD Insecure Random Number Generator Information Disclosure Weakness
- CVE-2007-6150: The internal state tracking code for the random and urandom devices in FreeBSD 5.5, 6.1 through 6.3, and 7.0 beta 4 allows local users to obtain portions of previously-accessed random values, which could be leveraged to bypass protection mechanisms that rely on secrecy of those values.
- SA27879: FreeBSD sys_dev_random Random Data Replay Vulnerability
- SECTRACK ID: 1019022: FreeBSD Kernel May Disclose Previously Read Pseudo Random Data to Local Users
Reported:
Nov 29, 2007
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.
For corrections or additions please email xforce@iss.net