Stunnel -n option in client mode contains format string

stunnel-client-format-string (7741) The risk level is classified as HighHigh Risk

Description:

Michael Trojnara's Stunnel is vulnerable to a format string attack when using the -n option with the smtp, pop, and nntp client modes. A malicious Web site operator can use this vulnerability to execute arbitrary code on the system with stunnel user privileges.


Consequences:

Gain Privileges

Remedy:

Upgrade to the latest version of stunnel (3.22 or later) available from the Stunnel web site. See References.

For EnGarde Secure Linux 1.0.1 (Finestra):
Upgrade to the latest version of stunnel (3.22-1.0.4 or later), as listed in EnGarde Secure Linux Security Advisory ESA-20011227-01. See References.

For Red Hat Linux 7.2:
Upgrade to the latest version of stunnel (3.22-1 or later), as listed in Red Hat Linux Errata Advisory RHSA-2002:002-10. See References.

For Mandrake Linux 8.1:
Upgrade to the latest version of stunnel (3.22-1.1mdk or later), as listed in MandrakeSoft Security Advisory MDKSA-2002:004 : stunnel. See References.

For other distributions:
Contact your vendor for upgrade or patch information.

References:

Platforms Affected:

  • EngardeLinux Secure Community 1.0.1
  • MandrakeSoft Mandrake Linux 8.1
  • MandrakeSoft Mandrake Linux 8.1 IA64
  • RedHat Linux 7
  • RedHat Linux 7.1
  • RedHat Linux 7.2
  • RedHat Linux 7.3
  • stunnel stunnel

Reported:

Dec 22, 2001

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