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Debian LTS Advisory DLA-3205-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                       Guilhem Moulin
November 25, 2022                             https://wiki.debian.org/LTS
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Package        : inetutils
Version        : 2:1.9.4-7+deb10u2
CVE ID         : CVE-2019-0053 CVE-2021-40491 CVE-2022-39028
Debian Bug     : 945861 956084 993476

Several security vulnerabilities were discovered in inetutils, a
collection of common network programs.

CVE-2019-0053

    inetutils' telnet client doesn't sufficiently validate environment
    variables, which can lead to stack-based buffer overflows.  This
    issue is limited to local exploitation from restricted shells.

CVE-2021-40491

    inetutils' ftp client before 2.2 does not validate addresses
    returned by PSV/LSPV responses to make sure they match the server
    address.  A malicious server can exploit this flaw to reach services
    in the client's private network.  (This is similar to curl's
    CVE-2020-8284.)

CVE-2022-39028

    inetutils's telnet server through 2.3 has a NULL pointer dereference
    which a client can trigger by sending 0xff 0xf7 or 0xff 0xf8.  In a
    typical installation, the telnetd application would crash but the
    telnet service would remain available through inetd.  However, if the
    telnetd application has many crashes within a short time interval,
    the telnet service would become unavailable after inetd logs a
    "telnet/tcp server failing (looping), service terminated" error.

For Debian 10 buster, these problems have been fixed in version
2:1.9.4-7+deb10u2.

We recommend that you upgrade your inetutils packages.

For the detailed security status of inetutils please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/inetutils

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

Debian LTS: DLA-3205-1: inetutils security update

November 25, 2022
Several security vulnerabilities were discovered in inetutils, a collection of common network programs

Summary

CVE-2019-0053

inetutils' telnet client doesn't sufficiently validate environment
variables, which can lead to stack-based buffer overflows. This
issue is limited to local exploitation from restricted shells.

CVE-2021-40491

inetutils' ftp client before 2.2 does not validate addresses
returned by PSV/LSPV responses to make sure they match the server
address. A malicious server can exploit this flaw to reach services
in the client's private network. (This is similar to curl's
CVE-2020-8284.)

CVE-2022-39028

inetutils's telnet server through 2.3 has a NULL pointer dereference
which a client can trigger by sending 0xff 0xf7 or 0xff 0xf8. In a
typical installation, the telnetd application would crash but the
telnet service would remain available through inetd. However, if the
telnetd application has many crashes within a short time interval,
the telnet service would become unavailable after inetd logs a
"telnet/tcp server failing (looping), s...

Read the Full Advisory


Severity
Package : inetutils
Version : 2:1.9.4-7+deb10u2
CVE ID : CVE-2019-0053 CVE-2021-40491 CVE-2022-39028
Debian Bug : 945861 956084 993476

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