Bug 2240268 (CVE-2023-42811)

Summary: CVE-2023-42811 aes-gcm: Plaintext exposed in decrypt_in_place_detached even on tag verification failure
Product: [Other] Security Response Reporter: Pedro Sampaio <psampaio>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Bug Depends On: 2240269, 2240270    
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Description Pedro Sampaio 2023-09-22 19:25:09 UTC 
aes-gcm is a pure Rust implementation of the AES-GCM. Starting in version 0.10.0 and prior to version 0.10.3, in the AES GCM implementation of decrypt_in_place_detached, the decrypted ciphertext (i.e. the correct plaintext) is exposed even if tag verification fails. If a program using the `aes-gcm` crate's `decrypt_in_place*` APIs accesses the buffer after decryption failure, it will contain a decryption of an unauthenticated input. Depending on the specific nature of the program this may enable Chosen Ciphertext Attacks (CCAs) which can cause a catastrophic breakage of the cipher including full plaintext recovery. Version 0.10.3 contains a fix for this issue.

https://docs.rs/aes-gcm/latest/src/aes_gcm/lib.rs.html#309
https://github.com/RustCrypto/AEADs/security/advisories/GHSA-423w-p2w9-r7vq
Comment 1 Pedro Sampaio 2023-09-22 19:26:51 UTC 
Created rust-aes-gcm tracking bugs for this issue:

Affects: epel-all [bug 2240270]
Affects: fedora-all [bug 2240269]