CVE-2013-4345: Medium severity linux kernel vulnerability
Published Sep 13, 2013
·Updated
A flaw was found in the way ansi cprng implementation in the Linux kernel processed non-block size aligned requests. If several small requests are made that are less than the instances block size, the remainder for loop code doesn't increment randdatavalid in the last iteration, meaning that the last bytes in the randdata buffer gets reused on the subsequent smaller-than-a-block request for random data.
Acknowledgements:
Red Hat would like to thank Stephan Mueller for reporting this issue.
Other sources
Off-by-one error in the getprngbytes function in crypto/ansicprng.c in the Linux kernel through 3.11.4 makes it easier for context-dependent attackers to defeat cryptographic protection mechanisms via multiple requests for small amounts of data, leading to improper management of the state of the consumed data.
— Launchpad
Affected Software
275 affected componentsFixes available
Linux Linux kernel<=3.11.4
Linux Linux kernel=3.0-rc1
Linux Linux kernel=3.0-rc2
Linux Linux kernel=3.0-rc3
Linux Linux kernel=3.0-rc4
Linux Linux kernel=3.0-rc5
Linux Linux kernel=3.0-rc6
Linux Linux kernel=3.0-rc7
Linux Linux kernel=3.0.1
Linux Linux kernel=3.0.2
Linux Linux kernel=3.0.3
Linux Linux kernel=3.0.4
Linux Linux kernel=3.0.5
Linux Linux kernel=3.0.6
Linux Linux kernel=3.0.7
Linux Linux kernel=3.0.8
Linux Linux kernel=3.0.9
Linux Linux kernel=3.0.10
Linux Linux kernel=3.0.11
Linux Linux kernel=3.0.12
Linux Linux kernel=3.0.13
Linux Linux kernel=3.0.14
Linux Linux kernel=3.0.15
Linux Linux kernel=3.0.16
Linux Linux kernel=3.0.17
Linux Linux kernel=3.0.18
Linux Linux kernel=3.0.19
Linux Linux kernel=3.0.20
Linux Linux kernel=3.0.21
Linux Linux kernel=3.0.22
Linux Linux kernel=3.0.23
Linux Linux kernel=3.0.24
Linux Linux kernel=3.0.25
Linux Linux kernel=3.0.26
Linux Linux kernel=3.0.27
Linux Linux kernel=3.0.28
Linux Linux kernel=3.0.29
Linux Linux kernel=3.0.30
Linux Linux kernel=3.0.31
Linux Linux kernel=3.0.32
Linux Linux kernel=3.0.33
Linux Linux kernel=3.0.34
Linux Linux kernel=3.0.35
Linux Linux kernel=3.0.36
Linux Linux kernel=3.0.37
Linux Linux kernel=3.0.38
Linux Linux kernel=3.0.39
Linux Linux kernel=3.0.40
Linux Linux kernel=3.0.41
Linux Linux kernel=3.0.42
Linux Linux kernel=3.0.43
Linux Linux kernel=3.0.44
Linux Linux kernel=3.0.45
Linux Linux kernel=3.0.46
Linux Linux kernel=3.0.47
Linux Linux kernel=3.0.48
Linux Linux kernel=3.0.49
Linux Linux kernel=3.0.50
Linux Linux kernel=3.0.51
Linux Linux kernel=3.0.52
Linux Linux kernel=3.0.53
Linux Linux kernel=3.0.54
Linux Linux kernel=3.0.55
Linux Linux kernel=3.0.56
Linux Linux kernel=3.0.57
Linux Linux kernel=3.0.58
Linux Linux kernel=3.0.59
Linux Linux kernel=3.0.60
Linux Linux kernel=3.0.61
Linux Linux kernel=3.0.62
Linux Linux kernel=3.0.63
Linux Linux kernel=3.0.64
Linux Linux kernel=3.0.65
Linux Linux kernel=3.0.66
Linux Linux kernel=3.0.67
Linux Linux kernel=3.0.68
Linux Linux kernel=3.1
Linux Linux kernel=3.1-rc1
Linux Linux kernel=3.1-rc2
Linux Linux kernel=3.1-rc3
Linux Linux kernel=3.1-rc4
Linux Linux kernel=3.1.1
Linux Linux kernel=3.1.2
Linux Linux kernel=3.1.3
Linux Linux kernel=3.1.4
Linux Linux kernel=3.1.5
Linux Linux kernel=3.1.6
Linux Linux kernel=3.1.7
Linux Linux kernel=3.1.8
Linux Linux kernel=3.1.9
Linux Linux kernel=3.1.10
Linux Linux kernel=3.2
Linux Linux kernel=3.2
Linux Linux kernel=3.2-rc2
Linux Linux kernel=3.2-rc3
Linux Linux kernel=3.2-rc4
Linux Linux kernel=3.2-rc5
Linux Linux kernel=3.2-rc6
Linux Linux kernel=3.2-rc7
Linux Linux kernel=3.2.1
Linux Linux kernel=3.2.2
Linux Linux kernel=3.2.3
Linux Linux kernel=3.2.4
Linux Linux kernel=3.2.5
Linux Linux kernel=3.2.6
Linux Linux kernel=3.2.7
Linux Linux kernel=3.2.8
Linux Linux kernel=3.2.9
Linux Linux kernel=3.2.10
Linux Linux kernel=3.2.11
Linux Linux kernel=3.2.12
Linux Linux kernel=3.2.13
Linux Linux kernel=3.2.14
Linux Linux kernel=3.2.15
Linux Linux kernel=3.2.16
Linux Linux kernel=3.2.17
Linux Linux kernel=3.2.18
Linux Linux kernel=3.2.19
Linux Linux kernel=3.2.20
Linux Linux kernel=3.2.21
Linux Linux kernel=3.2.22
Linux Linux kernel=3.2.23
Linux Linux kernel=3.2.24
Linux Linux kernel=3.2.25
Linux Linux kernel=3.2.26
Linux Linux kernel=3.2.27
Linux Linux kernel=3.2.28
Linux Linux kernel=3.2.29
Linux Linux kernel=3.2.30
Linux Linux kernel=3.3
Linux Linux kernel=3.3-rc1
Linux Linux kernel=3.3-rc2
Linux Linux kernel=3.3-rc3
Linux Linux kernel=3.3-rc4
Linux Linux kernel=3.3-rc5
Linux Linux kernel=3.3-rc6
Linux Linux kernel=3.3-rc7
Linux Linux kernel=3.3.1
Linux Linux kernel=3.3.2
Linux Linux kernel=3.3.3
Linux Linux kernel=3.3.4
Linux Linux kernel=3.3.5
Linux Linux kernel=3.3.6
Linux Linux kernel=3.3.7
Linux Linux kernel=3.3.8
Linux Linux kernel=3.4
Linux Linux kernel=3.4-rc1
Linux Linux kernel=3.4-rc2
Linux Linux kernel=3.4-rc3
Linux Linux kernel=3.4-rc3
Linux Linux kernel=3.4-rc4
Linux Linux kernel=3.4-rc5
Linux Linux kernel=3.4-rc6
Linux Linux kernel=3.4-rc7
Linux Linux kernel=3.4.1
Linux Linux kernel=3.4.2
Linux Linux kernel=3.4.3
Linux Linux kernel=3.4.4
Linux Linux kernel=3.4.5
Linux Linux kernel=3.4.6
Linux Linux kernel=3.4.7
Linux Linux kernel=3.4.8
Linux Linux kernel=3.4.9
Linux Linux kernel=3.4.10
Linux Linux kernel=3.4.11
Linux Linux kernel=3.4.12
Linux Linux kernel=3.4.13
Linux Linux kernel=3.4.14
Linux Linux kernel=3.4.15
Linux Linux kernel=3.4.16
Linux Linux kernel=3.4.17
Linux Linux kernel=3.4.18
Linux Linux kernel=3.4.19
Linux Linux kernel=3.4.20
Linux Linux kernel=3.4.21
Linux Linux kernel=3.4.22
Linux Linux kernel=3.4.23
Linux Linux kernel=3.4.24
Linux Linux kernel=3.4.25
Linux Linux kernel=3.4.26
Linux Linux kernel=3.4.27
Linux Linux kernel=3.4.28
Linux Linux kernel=3.4.29
Linux Linux kernel=3.4.30
Linux Linux kernel=3.4.31
Linux Linux kernel=3.4.32
Linux Linux kernel=3.5.1
Linux Linux kernel=3.5.2
Linux Linux kernel=3.5.3
Linux Linux kernel=3.5.4
Linux Linux kernel=3.5.5
Linux Linux kernel=3.5.6
Linux Linux kernel=3.5.7
Linux Linux kernel=3.6
Linux Linux kernel=3.6.1
Linux Linux kernel=3.6.2
Linux Linux kernel=3.6.3
Linux Linux kernel=3.6.4
Linux Linux kernel=3.6.5
Linux Linux kernel=3.6.6
Linux Linux kernel=3.6.7
Linux Linux kernel=3.6.8
Linux Linux kernel=3.6.9
Linux Linux kernel=3.6.10
Linux Linux kernel=3.6.11
Linux Linux kernel=3.7
Linux Linux kernel=3.7.1
Linux Linux kernel=3.7.2
Linux Linux kernel=3.7.3
Linux Linux kernel=3.7.4
Linux Linux kernel=3.7.5
Linux Linux kernel=3.7.6
Linux Linux kernel=3.7.7
Linux Linux kernel=3.7.8
Linux Linux kernel=3.7.9
Linux Linux kernel=3.7.10
Linux Linux kernel=3.8.0
Linux Linux kernel=3.8.1
Linux Linux kernel=3.8.2
Linux Linux kernel=3.8.3
Linux Linux kernel=3.8.4
Linux Linux kernel=3.8.5
Linux Linux kernel=3.8.6
Linux Linux kernel=3.8.7
Linux Linux kernel=3.8.8
Linux Linux kernel=3.8.9
Linux Linux kernel=3.8.10
Linux Linux kernel=3.8.11
Linux Linux kernel=3.8.12
Linux Linux kernel=3.8.13
Linux Linux kernel=3.9-rc1
Linux Linux kernel=3.9-rc2
Linux Linux kernel=3.9-rc3
Linux Linux kernel=3.9-rc4
Linux Linux kernel=3.9-rc5
Linux Linux kernel=3.9-rc6
Linux Linux kernel=3.9-rc7
Linux Linux kernel=3.9.0
Linux Linux kernel=3.9.1
Linux Linux kernel=3.9.2
Linux Linux kernel=3.9.3
Linux Linux kernel=3.9.4
Linux Linux kernel=3.9.5
Linux Linux kernel=3.9.6
Linux Linux kernel=3.9.7
Linux Linux kernel=3.9.8
Linux Linux kernel=3.9.9
Linux Linux kernel=3.9.10
Linux Linux kernel=3.9.11
Linux Linux kernel=3.10.1
Linux Linux kernel=3.10.2
Linux Linux kernel=3.10.3
Linux Linux kernel=3.10.4
Linux Linux kernel=3.10.5
Linux Linux kernel=3.10.6
Linux Linux kernel=3.10.7
Linux Linux kernel=3.10.8
Linux Linux kernel=3.10.9
Linux Linux kernel=3.10.10
Linux Linux kernel=3.10.11
Linux Linux kernel=3.10.12
Linux Linux kernel=3.11
Linux Linux kernel=3.11.1
Linux Linux kernel=3.11.2
Linux Linux kernel=3.11.3
Fedoraproject Fedora=18
Fedoraproject Fedora=19
redhat Enterprise Linux=5
redhat Enterprise Linux=6.0
redhat Enterprise MRG=2.0
redhat Enterprise MRG=2.1
redhat Enterprise MRG=2.2
redhat Enterprise MRG=2.3
redhat Enterprise MRG=2.4
debian/linux
5.10.223-15.10.234-16.1.129-16.1.135-16.12.25-16.12.27-1
Remediation
Patch Available
Event History
Sep 13, 2013
Data Sourced
via Red Hat·07:04 AM
DescriptionSeverityAffected Software
Oct 10, 2013
CVE Published
via MITRE·10:00 AM
Data Sourced
via MITRE·10:00 AM
Description
Jan 11, 2024
Data Sourced
via Launchpad·10:02 PM
Description
Sep 16, 2024
Data Sourced
via Ubuntu·01:00 AM
RemedyDescriptionSeverityAffected Software
Apr 24, 2025
Data Sourced
via Debian·02:07 AM
DescriptionAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2013-4345?
CVE-2013-4345 has been assigned a medium severity level due to its potential impact on the randomness generated by the kernel.
2
How do I fix CVE-2013-4345?
To fix CVE-2013-4345, it is recommended to update to a version of the Linux kernel that is not affected, such as versions 5.10.223-1 or 6.1.119-1.
3
Which Linux kernel versions are affected by CVE-2013-4345?
CVE-2013-4345 affects Linux kernel versions up to 3.11.4 and various release candidates like 3.0-rc1 to 3.0-rc7.
4
What type of vulnerability is CVE-2013-4345?
CVE-2013-4345 is a vulnerability related to the improper processing of non-block size aligned requests in the ANSI CPRNG implementation.
5
Can CVE-2013-4345 lead to security risks?
Yes, CVE-2013-4345 can lead to security risks by potentially compromising the randomness of cryptographic operations.