Timing attacks in python-rsa
It was found that python-rsa is vulnerable to Bleichenbacher timing attacks. An attacker can use this flaw via the RSA decryption API to decrypt parts of the cipher text encrypted with RSA.
Access Restriction Bypass
Python-RSA 4.0 ignores leading '\0' bytes during decryption of ciphertext. This could conceivably have a security-relevant impact, e.g., by helping an attacker to infer that an application uses Python-RSA, or if the length of accepted ciphertext affects application behavior (such as by causing excessive memory allocation).
Add padding length check as described by PKCS#1 v1.5 (Fixes
#164)
Reuse of blinding factors to speed up blinding operations.
Fixes #162.
Declare & test support for Python 3.9
Version 4.4 & 4.6 - released 2020-06-12
Version 4.4 and 4.6 are almost a re-tagged release of version 4.2. It requires
Python 3.5+. To avoid older Python installations from trying to upgrade to RSA
4.4, this is now made explicit in the python_requires argument in setup.py.
There was a mistake releasing 4.4 as "3.5+ only", which made it necessary to
retag 4.4 as 4.6 as well.
No functional changes compared to version 4.2.
Version 4.3 & 4.5 - released 2020-06-12
Version 4.3 and 4.5 are almost a re-tagged release of version 4.0. It is the
last to support Python 2.7. This is now made explicit in the python_requires
argument in setup.py. Python 3.4 is not supported by this release. There was a
mistake releasing 4.4 as "3.5+ only", which made it necessary to retag 4.3 as
4.5 as well.
Two security fixes have also been backported, so 4.3 = 4.0 + these two fixes.
Choose blinding factor relatively prime to N. Thanks Christian Heimes for pointing this out.
Reject cyphertexts (when decrypting) and signatures (when verifying) that have
been modified by prepending zero bytes. This resolves CVE-2020-13757. Thanks
Carnil for pointing this out.
Version 4.2 - released 2020-06-10
Rolled back the switch to Poetry, and reverted back to using Pipenv + setup.py
for dependency management. There apparently is an issue no-binary installs of
packages build with Poetry. This fixes
#148
Limited SHA3 support to those Python versions (3.6+) that support it natively.
The third-party library that adds support for this to Python 3.5 is a binary
package, and thus breaks the pure-Python nature of Python-RSA.
This should fix #147.
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Bumps rsa from 4.0 to 4.7. This update includes security fixes.
Vulnerabilities fixed
Sourced from The GitHub Security Advisory Database.
Sourced from The GitHub Security Advisory Database.
Changelog
Sourced from rsa's changelog.
... (truncated)
Commits
fa3282a
Bumped version to 4.7a364e82
Marked version 4.7 as released539c54a
Fix #170: mistake in examples of documentationb81e317
Declare support for and test Python 3.906ec1ea
Fix #162: Blinding uses slow algorithm341e5c4
Directly raiseDecryptionError
when crypto length is badf254895
Usebytes.find()
instead ofbytes.index()
240b0d8
Add link to changelogf878c37
Fix #164: Add padding length check as described by PKCS#1 v1.5dae8ce0
Fix #165: CVE-2020-25658 - Bleichenbacher-style timing oracleDependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
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