CVE-2020-36242
Published: 7 February 2021
In the cryptography package before 3.3.2 for Python, certain sequences of update calls to symmetrically encrypt multi-GB values could result in an integer overflow and buffer overflow, as demonstrated by the Fernet class.
Notes
| Author | Note |
|---|---|
| mdeslaur | Versions in groovy and earlier don't support chunking in update_into. Attempting reproducer on groovy and focal errors out with: OverflowError: integer 4294967296 does not fit '32-bit int' which seems to indicate there is a size check being performed and they aren't vulnerable to this issue. |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
python-cryptography Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(2.1.4-1ubuntu1.4)
|
| focal |
Not vulnerable
(2.8-3ubuntu0.1)
|
|
| groovy |
Not vulnerable
(3.0-1ubuntu0.1)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(3.3.2)
|
|
| xenial |
Not vulnerable
(1.2.3-1ubuntu0.3)
|
|
|
Patches: upstream: https://github.com/pyca/cryptography/commit/82b6ce28389f0a317bc55ba2091a74b346db7cae |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 9.1 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |