Fedora EPEL 6 update for libyubikey, pam_yubico, ykclient



Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2011-4120
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
Fedora
Operating systems & Components / Operating system

ykclient
Operating systems & Components / Operating system package or component

pam_yubico
Operating systems & Components / Operating system package or component

libyubikey
Operating systems & Components / Operating system package or component

Vendor Fedoraproject

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Input validation error

EUVDB-ID: #VU35033

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2011-4120

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

Yubico PAM Module before 2.10 performed user authentication when 'use_first_pass' PAM configuration option was not used and the module was configured as 'sufficient' in the PAM configuration. A remote attacker could use this flaw to circumvent common authentication process and obtain access to the account in question by providing a NULL value (pressing Ctrl-D keyboard sequence) as the password string.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 6

ykclient: before 2.7-1.el6

pam_yubico: before 2.10-1.el6

libyubikey: before 1.7-2.el6

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2012-0417


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.



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