Ubuntu.comUB:CVE-2017-11424CVE-2017-11424
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:N/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS
Percentile
35.1%
In PyJWT 1.5.0 and below the invalid_strings check in
HMACAlgorithm.prepare_key does not account for all PEM encoded public
keys. Specifically, the PKCS1 PEM encoded format would be allowed because
it is prefaced with the string -----BEGIN RSA PUBLIC KEY----- which is
not accounted for. This enables symmetric/asymmetric key confusion attacks
against users using the PKCS1 PEM encoded public keys, which would allow an
attacker to craft JWTs from scratch.
Notes
| Author | Note |
|---|---|
| tyhicks | The added deprecation warnings present in the fix probably aren’t needed in security backports |
Related
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:N/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS
Percentile
35.1%