title: Input buffer over-read in AES-XTS implementation on 64 bit ARM
description: Issue summary: The AES-XTS cipher decryption implementation for 64 bit ARM
platform contains a bug that could cause it to read past the input buffer,
leading to a crash.
Impact summary: Applications that use the AES-XTS algorithm on the 64 bit ARM
platform can crash in rare circumstances. The AES-XTS algorithm is usually
used for disk encryption.
The AES-XTS cipher decryption implementation for 64 bit ARM platform will read
past the end of the ciphertext buffer if the ciphertext size is 4 mod 5 in 16
byte blocks, e.g. 144 bytes or 1024 bytes. If the memory after the ciphertext
buffer is unmapped, this will trigger a crash which results in a denial of
service.
If an attacker can control the size and location of the ciphertext buffer
being decrypted by an application using AES-XTS on 64 bit ARM, the
application is affected. This is fairly unlikely making this issue
a Low severity one.
problem types: buffer over-read
affected:
{
defaultStatus: unaffected
product: OpenSSL
vendor: OpenSSL
versions:
lessThan: 3.1.1, status: affected, version: 3.1.0, versionType: semver
lessThan: 3.0.9, status: affected, version: 3.0.0, versionType: semver
}
metrics:
format: other
other: [
content: {'text': 'Low'}
type: https://www.openssl.org/policies/secpolicy.html
]