fetchmail
55
1.52. fetchmail
1.52.1. RHSA-2009:1427: Moderate security update
Important
This update has already been released (prior to the GA of this release) as the security
errata
RHSA-2009:1427
348
An updated fetchmail package that fixes multiple security issues is now available for Red Hat
Enterprise Linux 3, 4, and 5.
This update has been rated as having moderate security impact by the Red Hat Security Response
Team.
Fetchmail is a remote mail retrieval and forwarding utility intended for use over on-demand TCP/IP
links, such as SLIP and PPP connections.
It was discovered that fetchmail is affected by the previously published "null prefix attack", caused by
incorrect handling of NULL characters in X.509 certificates. If an attacker is able to get a carefully-
crafted certificate signed by a trusted Certificate Authority, the attacker could use the certificate
during a man-in-the-middle attack and potentially confuse fetchmail into accepting it by mistake.
(
CVE-2009-2666
349
)
A flaw was found in the way fetchmail handles rejections from a remote SMTP server when sending
warning mail to the postmaster. If fetchmail sent a warning mail to the postmaster of an SMTP server
and that SMTP server rejected it, fetchmail could crash. (
CVE-2007-4565
350
)
A flaw was found in fetchmail. When fetchmail is run in double verbose mode ("-v -v"), it could
crash upon receiving certain, malformed mail messages with long headers. A remote attacker
could use this flaw to cause a denial of service if fetchmail was also running in daemon mode ("-d").
(
CVE-2008-2711
351
)
Note: when using SSL-enabled services, it is recommended that the fetchmail "--sslcertck" option be
used to enforce strict SSL certificate checking.
All fetchmail users should upgrade to this updated package, which contains backported patches to
correct these issues. If fetchmail is running in daemon mode, it must be restarted for this update to
take effect (use the "fetchmail --quit" command to stop the fetchmail process).
349
https://www.redhat.com/security/data/cve/CVE-2009-2666.html
350
https://www.redhat.com/security/data/cve/CVE-2007-4565.html
351
https://www.redhat.com/security/data/cve/CVE-2008-2711.html
Summary of Contents for ENTERPRISE LINUX 5.5 - S 2010
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