#VU99952 Information exposure in Linux kernel - CVE-2004-2136

Vulnerability identifier: #VU99952

Vulnerability risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2004-2136

CWE-ID: CWE-200

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.

dm-crypt on Linux kernel 2.6.x, when used on certain file systems with a block size 1024 or greater, has certain 'IV computation' weaknesses that allow watermarked files to be detected without decryption.

Mitigation
Install update from vendor's repository.

Vulnerable software versions

Linux kernel: All versions

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External links
https://marc.info/?l=linux-kernel&m=107719798631935&w=2
https://mareichelt.de/pub/notmine/diskenc.pdf
https://www.securiteam.com/exploits/5UP0P1PFPM.html

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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.