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Patrick Schleizer 2019-07-13 16:26:14 +00:00
parent ca7e0e0161
commit ea8b22ee78
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1 changed files with 29 additions and 29 deletions
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58
debian/control vendored
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@ -28,35 +28,6 @@ Description: enhances misc security settings
restricts access to the root account;
increases the amount of hashing rounds used by shadow;
.
TCP time stamps (RFC 1323) allow for tracking clock
information with millisecond resolution. This may or may not allow an
attacker to learn information about the system clock at such
a resolution, depending on various issues such as network lag.
This information is available to anyone who monitors the network
somewhere between the attacked system and the destination server.
It may allow an attacker to find out how long a given
system has been running, and to distinguish several
systems running behind NAT and using the same IP address. It might
also allow one to look for clocks that match an expected value to find the
public IP used by a user.
.
Hence, this package disables this feature by shipping the
/etc/sysctl.d/tcp_timestamps.conf configuration file.
.
Note that TCP time stamps normally have some usefulness. They are
needed for:
.
* the TCP protection against wrapped sequence numbers; however, to
trigger a wrap, one needs to send roughly 2^32 packets in one
minute: as said in RFC 1700, "The current recommended default
time to live (TTL) for the Internet Protocol (IP) [45,105] is 64".
So, this probably won't be a practical problem in the context
of Anonymity Distributions.
* "Round-Trip Time Measurement", which is only useful when the user
manages to saturate their connection. When using Anonymity Distributions,
probably the limiting factor for transmission speed is rarely the capacity
of the user connection.
.
Netfilter's connection tracking helper module increases kernel attack
surface by enabling superfluous functionality such as IRC parsing in
the kernel. (!) Hence, this package disables this feature by shipping the
@ -155,3 +126,32 @@ Description: enhances misc security settings
using su to gain root access or switch user accounts.
.
Logging into the root account from a terminal is prevented.
.
TCP time stamps (RFC 1323) allow for tracking clock
information with millisecond resolution. This may or may not allow an
attacker to learn information about the system clock at such
a resolution, depending on various issues such as network lag.
This information is available to anyone who monitors the network
somewhere between the attacked system and the destination server.
It may allow an attacker to find out how long a given
system has been running, and to distinguish several
systems running behind NAT and using the same IP address. It might
also allow one to look for clocks that match an expected value to find the
public IP used by a user.
.
Hence, this package disables this feature by shipping the
/etc/sysctl.d/tcp_timestamps.conf configuration file.
.
Note that TCP time stamps normally have some usefulness. They are
needed for:
.
* the TCP protection against wrapped sequence numbers; however, to
trigger a wrap, one needs to send roughly 2^32 packets in one
minute: as said in RFC 1700, "The current recommended default
time to live (TTL) for the Internet Protocol (IP) [45,105] is 64".
So, this probably won't be a practical problem in the context
of Anonymity Distributions.
* "Round-Trip Time Measurement", which is only useful when the user
manages to saturate their connection. When using Anonymity Distributions,
probably the limiting factor for transmission speed is rarely the capacity
of the user connection.