Cryptographic issues in GNU PyCrypto

1) Cryptographic issues

EUVDB-ID: #VU43979

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2012-2417

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

PyCrypto before 2.6 does not produce appropriate prime numbers when using an ElGamal scheme to generate a key, which reduces the signature space or public key space and makes it easier for attackers to conduct brute force attacks to obtain the private key.

Mitigation

Install update from vendor's website.

Vulnerable software versions

PyCrypto: 1.0.0 - 2.4.1

External links

http://lists.fedoraproject.org/pipermail/package-announce/2012-June/081713.html
http://lists.fedoraproject.org/pipermail/package-announce/2012-June/081759.html
http://lists.fedoraproject.org/pipermail/package-announce/2012-June/081789.html
http://secunia.com/advisories/49263
http://www.debian.org/security/2012/dsa-2502
http://www.mandriva.com/security/advisories?name=MDVSA-2012:117
http://www.openwall.com/lists/oss-security/2012/05/25/1
http://www.osvdb.org/82279
http://www.securityfocus.com/bid/53687
http://bugs.launchpad.net/pycrypto/+bug/985164
http://exchange.xforce.ibmcloud.com/vulnerabilities/75871
http://github.com/dlitz/pycrypto/blob/373ea760f21701b162e8c4912a66928ee30d401a/ChangeLog
http://github.com/Legrandin/pycrypto/commit/9f912f13df99ad3421eff360d6a62d7dbec755c2
http://hermes.opensuse.org/messages/15083589

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.