[Bug 1988548] Re: Missing fix for CVE-2022-37434 in zlib1g in focal and jammy

[Launchpad Bug Tracker]

This bug was fixed in the package zlib - 1:1.2.11.dfsg-2ubuntu9.2

---------------
zlib (1:1.2.11.dfsg-2ubuntu9.2) jammy-security; urgency=medium

  * SECURITY UPDATE: heap-based buffer over-read (LP: #1988548)
    - debian/patches/CVE-2022-37434-1.patch: in inflate.c, add an extra
      condition to check if state->head->extra_max is greater than len
      before copying, and move the len assignment to be placed before the
      check.
    - debian/patches/CVE-2022-37434-2.patch: in the previous patch, in
      inflate.c, the place of the len assignment was causing issues so it
      was moved to be placed within the check.
    - CVE-2022-37434

 -- Rodrigo Figueiredo Zaiden <rodrigo.zaiden at canonical.com>  Fri, 14
Oct 2022 18:33:00 -0300

** Changed in: zlib (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1988548

Title:
  Missing fix for CVE-2022-37434 in zlib1g in focal and jammy

Status in zlib package in Ubuntu:
  Fix Released

Bug description:
  There is a crictical security issue with zlib tracked here [1]

  The newest version in bionic [2] already has a security patch for it
  but the one in the focal [3] (and jammy) does not. As can be seen from
  their respective changelogs in the right hand side panel.

  Since zlib is loaded by lots of software, e.g. the apache weg server,
  this could be a problem. It seems that focal, jammy and bionic use the
  same base zlib version (1.2.11), so maybe the patch there could be
  recycled?

  I was asked to create a bug here after asking it as question here [4].
  Thank you very much for your hard work!

  [1] CVE: https://nvd.nist.gov/vuln/detail/CVE-2022-37434
  [2] Bionic Package: https://packages.ubuntu.com/bionic/zlib1g
  [3] Focal Package: https://packages.ubuntu.com/focal/zlib1g
  [4] Original Question: https://answers.launchpad.net/ubuntu/+source/zlib/+question/703010

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