Improper Authorization in Debian Linux

1) Improper Authorization

EUVDB-ID: #VU40091

Risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-7143

CWE-ID: CWE-285 - Improper Authorization

Exploit availability: No

Description

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

The m_authenticate function in modules/m_sasl.c in Charybdis before 3.5.3 allows remote attackers to spoof certificate fingerprints and consequently log in as another user via a crafted AUTHENTICATE parameter.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Debian Linux: 8.0

CPE2.3

External links

http://www.debian.org/security/2016/dsa-3661
http://www.openwall.com/lists/oss-security/2016/09/04/3
http://www.openwall.com/lists/oss-security/2016/09/05/8
http://www.securityfocus.com/bid/92761
http://github.com/charybdis-ircd/charybdis/blob/charybdis-3.5.3/NEWS.md
http://github.com/charybdis-ircd/charybdis/commit/818a3fda944b26d4814132cee14cfda4ea4aa824

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.