#VU43349 Permissions, Privileges, and Access Controls in INN - CVE-2012-3523

Vulnerability identifier: #VU43349

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2012-3523

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
INN
Other software / Other software solutions

Vendor: ISC

Description

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

The STARTTLS implementation in nnrpd in INN before 2.5.3 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack, a similar issue to CVE-2011-0411.

Mitigation
Install update from vendor's website.

Vulnerable software versions

INN: 1.4sec - 2.4.0

---

External links
https://lists.opensuse.org/opensuse-updates/2012-09/msg00058.html
https://secunia.com/advisories/50661
https://www.mandriva.com/security/advisories?name=MDVSA-2012:156

---

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.