Description
The _Rsa15 class in the RSA 1.5 algorithm implementation in jwa.py in jwcrypto before 0.3.2 lacks the Random Filling protection mechanism, which makes it easier for remote attackers to obtain cleartext data via a Million Message Attack (MMA).
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | python-jwcrypto | 0.3.2-1 | — |
| Debian 13 | python-jwcrypto | 0.3.2-1 | — |
| Debian 12 | python-jwcrypto | 0.3.2-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | python-jwcrypto | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | jwcrypto | < 0.3.2 | 0.3.2 | GHSA-wg33-x934-3ghh |
| PyPI | jwcrypto | < 0.4.0 | 0.4.0 | PYSEC-2016-4 |