#VU95256 Predictable seed in pseudo-random number generator (prng) in Linux kernel - CVE-2007-2453
Vulnerability identifier: #VU95256
Vulnerability risk: Low
CVSSv4.0: 0.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2007-2453
CWE-ID:
CWE-337
Exploitation vector: Local
Exploit availability: No
Vulnerable software:
Linux kernel
Operating systems & Components /
Operating system
Vendor: Linux Foundation
Description
The vulnerability allows a local user to gain access to sensitive information.
The random number feature in Linux kernel 2.6 before 2.6.20.13, and 2.6.21.x before 2.6.21.4, (1) does not properly seed pools when there is no entropy, or (2) uses an incorrect cast when extracting entropy, which might cause the random number generator to provide the same values after reboots on systems without an entropy source.
Mitigation
Install update from vendor's repository.
Vulnerable software versions
Linux kernel: All versions
External links
https://marc.info/?l=linux-kernel&m=118128610219959&w=2
https://marc.info/?l=linux-kernel&m=118128622431272&w=2
https://osvdb.org/37114
https://secunia.com/advisories/25596
https://secunia.com/advisories/25700
https://secunia.com/advisories/25961
https://secunia.com/advisories/26133
https://secunia.com/advisories/26139
https://secunia.com/advisories/26450
https://secunia.com/advisories/26620
https://secunia.com/advisories/26664
https://www.debian.org/security/2007/dsa-1356
https://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.21.4
https://www.mandriva.com/security/advisories?name=MDKSA-2007:171
https://www.mandriva.com/security/advisories?name=MDKSA-2007:196
https://www.mandriva.com/security/advisories?name=MDKSA-2007:216
https://www.novell.com/linux/security/advisories/2007_43_kernel.html
https://www.novell.com/linux/security/advisories/2007_51_kernel.html
https://www.securityfocus.com/bid/24390
https://www.securitytracker.com/id?1018248
https://www.ubuntu.com/usn/usn-470-1
https://www.ubuntu.com/usn/usn-486-1
https://www.ubuntu.com/usn/usn-489-1
https://www.vupen.com/english/advisories/2007/2105
https://exchange.xforce.ibmcloud.com/vulnerabilities/34781
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9960
https://rhn.redhat.com/errata/RHSA-2007-0376.html
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
