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Bug 1542313 - (CVE-2018-6594) CVE-2018-6594 python-crypto: Weak ElGamal key parameters in PublicKey/ElGamal.py allow attackers to obtain sensitive information by reading ciphertext
CVE-2018-6594 python-crypto: Weak ElGamal key parameters in PublicKey/ElGamal...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20180203,repor...
: Security
Depends On: 1542315 1542314 1542316 1543114 1543115 1543116
Blocks: 1542317
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Reported: 2018-02-06 00:15 EST by Sam Fowler
Modified: 2018-06-29 18:32 EDT (History)
53 users (show)

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Description Sam Fowler 2018-02-06 00:15:01 EST 
lib/Crypto/PublicKey/ElGamal.py in PyCrypto through 2.6.1 generates weak ElGamal key parameters, which allows attackers to obtain sensitive information by reading ciphertext data (i.e., it does not have semantic security in face of a ciphertext-only attack).


External References:

https://github.com/TElgamal/attack-on-pycrypto-elgamal
https://github.com/Legrandin/pycryptodome/issues/90

Upstream Issue:

https://github.com/dlitz/pycrypto/issues/253
Comment 1 Sam Fowler 2018-02-06 00:15:49 EST 
Created python-crypto tracking bugs for this issue:

Affects: epel-all [bug 1542315]
Affects: fedora-all [bug 1542314]
Comment 5 Joshua Padman 2018-02-08 22:54:13 EST 
The Red Hat OpenStack packages that use functionality from the python-crypto libraries do not use the ElGamal functionality. Whilst the python-crypto code shipped is vulnerable, the vulnerable functionality is not used. Therefore, the Red Hat OpenStack python-crypto package will not be fixed at this stage.
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