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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.1864
                       USN-4968-2: LZ4 vulnerability
                                1 June 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           LZ4
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-3520  

Reference:         ESB-2021.1818
                   ESB-2021.1791

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-4968-2

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USN-4968-2: LZ4 vulnerability
31 May 2021

LZ4 could be made to crash or run programs if it opened a specially crafted
file.
Releases

  o Ubuntu 16.04 ESM
  o Ubuntu 14.04 ESM

Packages

  o lz4 - Extremely fast compression algorithm

Details

USN-4968-1 fixed a vulnerability in LZ4. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

It was discovered that LZ4 incorrectly handled certain memory operations.
If a user or automated system were tricked into uncompressing a specially-
crafted LZ4 file, a remote attacker could use this issue to cause LZ4 to
crash, resulting in a denial of service, or possibly execute arbitrary
code.

Update instructions

The problem can be corrected by updating your system to the following package
versions:

Ubuntu 16.04

  o liblz4-1 - 0.0~r131-2ubuntu2+esm1
    Available with UA Infra or UA Desktop

Ubuntu 14.04

  o liblz4-1 - 0.0~r114-2ubuntu1+esm2
    Available with UA Infra or UA Desktop

In general, a standard system update will make all the necessary changes.

References

  o CVE-2021-3520

Related notices

  o USN-4968-1 : lz4, liblz4-tool, liblz4-dev, liblz4-1

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