Joined: 12 May 2004
|Posted: Mon Jan 22, 2007 9:26 pm Post subject: [ GLSA 200701-13 ] Fetchmail: Denial of Service and password
|Gentoo Linux Security Advisory
Title: Fetchmail: Denial of Service and password disclosure (GLSA 200701-13)
Date: January 22, 2007
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.
Vulnerable: < 6.3.6
Unaffected: >= 6.3.6
Architectures: All supported architectures
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:
|# emerge --sync
# emerge --ask --oneshot --verbose ">=net-mail/fetchmail-6.3.6"