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redhatRedHatRHSA-2011:0262
HistoryFeb 16, 2011 - 12:00 a.m.

(RHSA-2011:0262) Low: sendmail security and bug fix update

2011-02-1600:00:00
access.redhat.com
23

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

0.005 Low

EPSS

Percentile

74.6%

Sendmail is a Mail Transport Agent (MTA) used to send mail between
machines.

A flaw was found in the way sendmail handled NUL characters in the
CommonName field of X.509 certificates. An attacker able to get a
carefully-crafted certificate signed by a trusted Certificate Authority
could trick sendmail into accepting it by mistake, allowing the attacker to
perform a man-in-the-middle attack or bypass intended client certificate
authentication. (CVE-2009-4565)

The CVE-2009-4565 issue only affected configurations using TLS with
certificate verification and CommonName checking enabled, which is not a
typical configuration.

This update also fixes the following bugs:

  • Previously, sendmail did not correctly handle mail messages that had a
    long first header line. A line with more than 2048 characters was split,
    causing the part of the line exceeding the limit, as well as all of the
    following mail headers, to be incorrectly handled as the message body.
    (BZ#499450)

  • When an SMTP-sender is sending mail data to sendmail, it may spool that
    data to a file in the mail queue. It was found that, if the SMTP-sender
    stopped sending data and a timeout occurred, the file may have been left
    stalled in the mail queue, instead of being deleted. This update may not
    correct this issue for every situation and configuration. Refer to the
    Solution section for further information. (BZ#434645)

  • Previously, the sendmail macro MAXHOSTNAMELEN used 64 characters as the
    limit for the hostname length. However, in some cases, it was used against
    an FQDN length, which has a maximum length of 255 characters. With this
    update, the MAXHOSTNAMELEN limit has been changed to 255. (BZ#485380)

All sendmail users should upgrade to these updated packages, which contain
backported patches to correct these issues. After installing this update,
sendmail will be restarted automatically.

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

0.005 Low

EPSS

Percentile

74.6%