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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

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

October 8, 2020
CVE-2019-11840 An issue was discovered in supplementary Go cryptography libraries, aka golang-googlecode-go-crypto

Summary

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


Severity
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