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

    Date 08 Oct 2020
    333
    Posted By LinuxSecurity Advisories
    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
    
    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-2402-1                This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/lts/security/                            Brian May
    October 08, 2020                              https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------
    
    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
    

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