Debian DSA-1985-1 : sendmail - insufficient input validation

high Nessus Plugin ID 44849



The remote Debian host is missing a security-related update.


It was discovered that sendmail, a Mail Transport Agent, does not properly handle a '\0' character in a Common Name (CN) field of an X.509 certificate.

This allows an attacker to spoof arbitrary SSL-based SMTP servers via a crafted server certificate issued by a legitimate Certification Authority, and to bypass intended access restrictions via a crafted client certificate issued by a legitimate Certification Authority.


Upgrade the sendmail package.

For the oldstable distribution (etch), this problem has been fixed in version 8.13.8-3+etch1

For the stable distribution (lenny), this problem has been fixed in version 8.14.3-5+lenny1

See Also

Plugin Details

Severity: High

ID: 44849

File Name: debian_DSA-1985.nasl

Version: 1.22

Type: local

Agent: unix

Published: 2/24/2010

Updated: 1/4/2021

Supported Sensors: Frictionless Assessment Agent, Nessus Agent

Risk Information


Risk Factor: Low

Score: 3.4


Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

Temporal Vector: E:U/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:sendmail, cpe:/o:debian:debian_linux:4.0, cpe:/o:debian:debian_linux:5.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 1/31/2010

Reference Information

CVE: CVE-2009-4565

BID: 37543

DSA: 1985

IAVA: 2010-A-0002

CWE: 310