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[ GLSA 201006-12 ] Fetchmail: Multiple vulnerabilities
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PostPosted: Wed Jun 02, 2010 3:26 am    Post subject: [ GLSA 201006-12 ] Fetchmail: Multiple vulnerabilities Reply with quote

Gentoo Linux Security Advisory

Title: Fetchmail: Multiple vulnerabilities (GLSA 201006-12)
Severity: normal
Exploitable: remote
Date: June 01, 2010
Bug(s): #280537, #307761
ID: 201006-12

Synopsis


Multiple vulnerabilities have been reported in Fetchmail, allowing remote
attackers to execute arbitrary code or to conduct Man-in-the-Middle
attacks.


Background


Fetchmail is a remote mail retrieval and forwarding utility.


Affected Packages

Package: net-mail/fetchmail
Vulnerable: < 6.3.14
Unaffected: >= 6.3.14
Architectures: All supported architectures


Description


Multiple vulnerabilities have been reported in Fetchmail:
  • The sdump() function might trigger a heap-based buffer overflow
    during the escaping of non-printable characters with the high bit set
    from an X.509 certificate (CVE-2010-0562).
  • The vendor reported
    that Fetchmail does not properly handle Common Name (CN) fields in
    X.509 certificates that contain an ASCII NUL character. Specifically,
    the processing of such fields is stopped at the first occurrence of a
    NUL character. This type of vulnerability was recently discovered by
    Dan Kaminsky and Moxie Marlinspike (CVE-2009-2666).


Impact


A remote attacker could entice a user to connect with Fetchmail to a
specially crafted SSL-enabled server in verbose mode, possibly
resulting in the execution of arbitrary code with the privileges of the
user running the application. NOTE: The issue is only existent on
platforms on which char is signed.

Furthermore, a remote attacker might employ a specially crafted X.509
certificate, containing a NUL character in the Common Name field to
conduct man-in-the-middle attacks on SSL connections made using
Fetchmail.


Workaround


There is no known workaround at this time.


Resolution


All Fetchmail users should upgrade to the latest version:
Code:
# emerge --sync
    # emerge --ask --oneshot --verbose ">=net-mail/fetchmail-6.3.14"


References

CVE-2010-0562
CVE-2009-2666
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