[arch-security] [ASA-201505-15] nbd: denial of service
anthraxx at archlinux.org
Tue May 26 00:29:34 UTC 2015
Arch Linux Security Advisory ASA-201505-15
Date : 2015-05-26
CVE-ID : CVE-2015-0847
Package : nbd
Type : denial of service
Remote : Yes
Link : https://wiki.archlinux.org/index.php/CVE
The package nbd before version 3.11-1 is vulnerable to denial of service.
Upgrade to 3.11-1.
# pacman -Syu "nbd>=3.11-1"
The problem has been fixed upstream in version 3.11.
Signal handlers themselves were entered only once, but they called
posixly unsafe, non-reentrant functions, such as syslog(). If a signal
was caught in the middle of the execution of such function, consequences
were undefined. In practice, nbd-server was observed to deadlock during
the execution of sigchld_handler().
A remote attacker is able to send requests to the nbd server that may
lead to a deadlock resulting in denial of service.
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