[arch-security] [ASA-201705-1] dovecot: denial of service
rgacogne at archlinux.org
Mon May 1 14:56:43 UTC 2017
Arch Linux Security Advisory ASA-201705-1
Date : 2017-05-01
CVE-ID : CVE-2017-2669
Package : dovecot
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-238
The package dovecot before version 18.104.22.168-1 is vulnerable to denial
Upgrade to 22.214.171.124-1.
# pacman -Syu "dovecot>=126.96.36.199-1"
The problem has been fixed upstream in version 188.8.131.52.
A security issue has been found in Dovecot >= 2.2.26 and <= 2.2.28. If
the "dict" passdb is used for authentication, the username sent by the
client is passed to the var_expand() function and double expansion of
%-variables is performed. A remote unauthenticated attacker could then
send a specially crafted username containing %variables to cause a
denial of service.
A remote, unauthenticated attacker can cause a denial of service by
sending a specially crafted username.
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