4.3 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
0.004 Low
EPSS
Percentile
74.2%
Dwayne C. Litzenberger of PyCrypto reports:
In the ElGamal schemes (for both encryption and signatures), g is
supposed to be the generator of the entire Z^_p group. However, in
PyCrypto 2.5 and earlier, g is more simply the generator of a random
sub-group of Z^_p.
The result is that the signature space (when the key is used for
signing) or the public key space (when the key is used for encryption)
may be greatly reduced from its expected size of log(p) bits, possibly
down to 1 bit (the worst case if the order of g is 2).
While it has not been confirmed, it has also been suggested that an
attacker might be able to use this fact to determine the private key.
Anyone using ElGamal keys should generate new keys as soon as
practical.
Any additional information about this bug will be tracked at
https://bugs.launchpad.net/pycrypto/+bug/985164
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
FreeBSD | any | noarch | py-pycrypto | =Β 2.5 | UNKNOWN |
FreeBSD | any | noarch | py-pycrypto | <Β 2.6 | UNKNOWN |