Fetchmail: Denial of Service and password disclosure — GLSA 200701-13

Fetchmail has been found to have numerous vulnerabilities allowing for Denial of Service and password disclosure.

Affected Packages

net-mail/fetchmail on all architectures
Affected versions < 6.3.6
Unaffected versions >= 6.3.6

Background

Fetchmail is a remote mail retrieval and forwarding utility.

Description

Neil Hoggarth has discovered that when delivering messages to a message delivery agent by means of the "mda" option, Fetchmail passes a NULL pointer to the ferror() and fflush() functions when refusing a message. Isaac Wilcox has discovered numerous means of plain-text password disclosure due to errors in secure connection establishment.

Impact

An attacker could deliver a message via Fetchmail to a message delivery agent configured to refuse the message, and crash the Fetchmail process. SMTP and LMTP delivery modes are not affected by this vulnerability. An attacker could also perform a Man-in-the-Middle attack, and obtain plain-text authentication credentials of users connecting to a Fetchmail process.

Workaround

There is no known workaround at this time.

Resolution

All fetchmail users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=net-mail/fetchmail-6.3.6"

References

Release Date
January 22, 2007

Latest Revision
January 22, 2007: 01

Severity
normal

Exploitable
remote

Bugzilla entries