A golang-go.crypto security update security update has been released for Debian GNU/Linux 9 LTS to address three security issues.

DLA 2402-1: golang-go.crypto security update

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Debian LTS Advisory DLA-2402-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Brian May
October 08, 2020   https://wiki.debian.org/LTS
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Package : golang-go.crypto
Version : 1:0.0~git20170407.0.55a552f+REALLY.0.0~git20161012.0.5f31782-1+deb8u1
CVE ID : CVE-2019-11840 CVE-2019-11841 CVE-2020-9283

CVE-2019-11840

An issue was discovered in supplementary Go cryptography libraries, aka
golang-googlecode-go-crypto. If more than 256 GiB of keystream is
generated, or if the counter otherwise grows greater than 32 bits, the amd64
implementation will first generate incorrect output, and then cycle back to
previously generated keystream. Repeated keystream bytes can lead to loss of
confidentiality in encryption applications, or to predictability in CSPRNG
applications.

CVE-2019-11841

A message-forgery issue was discovered in
crypto/openpgp/clearsign/clearsign.go in supplementary Go cryptography
libraries. The "Hash" Armor Header specifies the message digest
algorithm(s) used for the signature. Since the library skips Armor Header
parsing in general, an attacker can not only embed arbitrary Armor Headers,
but also prepend arbitrary text to cleartext messages without invalidating
the signatures.

CVE-2020-9283

golang.org/x/crypto allows a panic during signature verification in the
golang.org/x/crypto/ssh package. A client can attack an SSH server that accepts
public keys. Also, a server can attack any SSH client.

For Debian 9 stretch, these problems have been fixed in version
1:0.0~git20170407.0.55a552f+REALLY.0.0~git20161012.0.5f31782-1+deb8u1.

We recommend that you upgrade your golang-go.crypto packages.

For the detailed security status of golang-go.crypto please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/golang-go.crypto

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