Constant-Time Key Printing Vulnerability in dm crypt
Summary
GSD-2022-1003646: dm crypt: make printing of the key constant-time. Affects Kernel versions < 4617778417d0a8c59f309b5eea21d943877f3c74. No fix is published. How to fix ↓
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Background
dm crypt is a disk encryption subsystem in the Linux Kernel that provides transparent encryption of block devices. It is used to protect sensitive data stored on disks by encrypting it with a user-defined key. The vulnerability identified in dm crypt allows an attacker to potentially extract the encryption key by exploiting timing side-channel attacks during the key printing process.
Vulnerability Detail
The vulnerability arises from the lack of constant-time implementation when printing the encryption key in dm crypt. By carefully measuring the time it takes to print each character of the key, an attacker can infer the key's value. This can lead to unauthorized access to encrypted data and compromise the confidentiality of the system. The impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability.
Conclusion
The constant-time key printing vulnerability in dm crypt can potentially compromise the confidentiality of encrypted data. It is recommended to update the Linux Kernel to version v5.10.120 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
dm crypt is a disk encryption subsystem in the Linux Kernel that provides transparent encryption of block devices.
The vulnerability allows an attacker to potentially extract the encryption key, leading to unauthorized access to encrypted data and compromising system confidentiality.
To fix this vulnerability, update the Linux Kernel to version v5.10.120 or any subsequent version that includes the fix.
No specific workaround has been mentioned for this vulnerability.
No, the impact and attack plausibility of this vulnerability have not been proven yet.
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