#VU44782 Buffer overflow in Stunnel - CVE-2011-2940

Vulnerability identifier: #VU44782

Vulnerability 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-2011-2940

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Stunnel
Client/Desktop applications / Encryption software

Vendor: Stunnel.org

Description

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

stunnel 4.40 and 4.41 might allow remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Stunnel: 4.40 - 4.41

---

External links
https://secunia.com/advisories/45705
https://securitytracker.com/id?1025959
https://stunnel.org/?page=sdf_ChangeLog
https://www.openwall.com/lists/oss-security/2011/08/19/18
https://www.openwall.com/lists/oss-security/2011/08/19/6
https://www.osvdb.org/74600
https://www.securityfocus.com/bid/49254
https://www.stunnel.org/pipermail/stunnel-announce/2011-August/000059.html
https://bugzilla.redhat.com/show_bug.cgi?id=732068
https://exchange.xforce.ibmcloud.com/vulnerabilities/69318

---

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.