Fetchmail: Denial of Service and password disclosure
Gentoo Linux Security Advisory
||GLSA 200701-13 / fetchmail
||January 22, 2007
||January 22, 2007: 01
All supported architectures
Fetchmail has been found to have numerous vulnerabilities allowing for
Denial of Service and password disclosure.
Fetchmail is a remote mail retrieval and forwarding utility.
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.
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.
There is no known workaround at this time.
All fetchmail users should upgrade to the latest version:
Code Listing 3.1: Resolution
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-mail/fetchmail-6.3.6"