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UW IMAP toolkit: Multiple vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200911-03 / c-client uw-imap
Release Date November 25, 2009
Latest Revision November 25, 2009: 01
Impact high
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-libs/c-client < 2007e >= 2007e All supported architectures
net-mail/uw-imap < 2007e >= 2007e All supported architectures

Related bugreports: #245425, #252567


Multiple vulnerabilities have been found in the UW IMAP toolkit and the c-client library, the worst of which leading to the execution of arbitrary code.

2.  Impact Information


The UW IMAP toolkit is a daemon for the IMAP and POP3 network mail protocols. The c-client library provides an API for IMAP, POP3 and other protocols.


Multiple vulnerabilities were found in the UW IMAP toolkit:

  • Aron Andersson and Jan Sahlin of Bitsec reported boundary errors in the "tmail" and "dmail" utilities when processing overly long mailbox names, leading to stack-based buffer overflows (CVE-2008-5005).
  • An error in smtp.c in the c-client library was found, leading to a NULL pointer dereference vulnerability (CVE-2008-5006).
  • Ludwig Nussel reported an off-by-one error in the rfc822_output_char() function in the RFC822BUFFER routines in the c-client library, as used by the UW IMAP toolkit (CVE-2008-5514).


A remote attacker could send an e-mail to a destination mailbox name composed of a username and '+' character followed by a long string, possibly leading to the execution of arbitrary code. A local attacker could gain privileges by specifying a long folder extension argument to the tmail or dmail program. Furthermore, a remote attacker could send a specially crafted mail message to the UW IMAP toolkit or another daemon using the c-client library, leading to a Denial of Service. A remote SMTP server could respond to the QUIT command with a close of the TCP connection instead of the expected 221 response code, possibly leading to a Denial of Service.

3.  Resolution Information


There is no known workaround at this time.


All c-client library users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-libs/c-client-2007e"

All UW IMAP toolkit users should upgrade to the latest version:

Code Listing 3.2: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-mail/uw-imap-2007e"

4.  References


Page updated November 25, 2009

Summary: This is a Gentoo Linux Security Advisory

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