Code Injection in Stunnel

1) Code Injection

EUVDB-ID: #VU43015

Risk: Medium

CVSSv3.1: 6.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-1762

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to #BASIC_IMPACT#.

stunnel 4.21 through 4.54, when CONNECT protocol negotiation and NTLM authentication are enabled, does not correctly perform integer conversion, which allows remote proxy servers to execute arbitrary code via a crafted request that triggers a buffer overflow.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Stunnel: 4.21 - 4.53

External links

http://rhn.redhat.com/errata/RHSA-2013-0714.html
http://www.debian.org/security/2013/dsa-2664
http://www.mandriva.com/security/advisories?name=MDVSA-2013:130
http://wiki.mageia.org/en/Support/Advisories/MGASA-2013-0097
http://www.stunnel.org/CVE-2013-1762.html

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.