#VU248 Improper input validation in OpenSSL - CVE-2003-0544

Vulnerability identifier: #VU248

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2003-0544

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenSSL
Server applications / Encryption software

Vendor: OpenSSL Software Foundation

Description
The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to incorrect tracking of the number of characters in certain ASN.1 inputs. A remote unauthenticated attacker can cause a denial of service by sending an SSL client certificate that causes OpenSSL to read past the end of a buffer when the long form is used.

Successful exploitation of this vulnerability may result in a denial of service.

Mitigation
Upgrade your version to OpenSSL 0.9.6k or OpenSSL 0.9.7c.

Vulnerable software versions

OpenSSL: 0.9.6c - 0.9.6, 0.9.7a - 0.9.7

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External links
https://www.openssl.org/news/vulnerabilities.html#y2002

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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.