GHSA-mx76-r943-rf8g
Bouncy Castle LTS native GCM chunking can cause bad-tag exception on decryption
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Maven | org.bouncycastle:bcprov-lts8on | >= 2.73.0, < 2.73.11 | 2.73.11 |
Details
As written in the advisory (Markdown source, shown as plain text).
In Bouncy Castle LTS for Java, the AES/GCM native implementation used on Intel CPUs with AES PAA instruction sets (AVX / VAES / VAESF variants) can intermittently produce an incorrect authentication tag verification result during decryption when the ciphertext is fed in via a mix of `update()` calls followed by `doFinal()`. It is possible to work around it by either using `doFinal()` only (as the BCJSSE does) or by configuring the module to run in pure Java mode, by setting the system property "org.bouncycastle.native.cpu_variant" to java.
References
External links from the advisory. They lead to third-party sites.