Medium: git

Issue Overview:

Git is an open-source distributed revision control system. In affected versions of Git a specially crafted repository that contains symbolic links as well as files using a clean/smudge filter such as Git LFS, may cause just-checked out script to be executed while cloning onto a case-insensitive file system such as NTFS, HFS+ or APFS (i.e. the default file systems on Windows and macOS). Note that clean/smudge filters have to be configured for that. Git for Windows configures Git LFS by default, and is therefore vulnerable. The problem has been patched in the versions published on Tuesday, March 9th, 2021. As a workaound, if symbolic link support is disabled in Git (e.g. via git config --global core.symlinks false), the described attack won’t work. Likewise, if no clean/smudge filters such as Git LFS are configured globally (i.e. before cloning), the attack is foiled. As always, it is best to avoid cloning repositories from untrusted sources. The earliest impacted version is 2.14.2. The fix versions are: 2.30.1, 2.29.3, 2.28.1, 2.27.1, 2.26.3, 2.25.5, 2.24.4, 2.23.4, 2.22.5, 2.21.4, 2.20.5, 2.19.6, 2.18.5, 2.17.62.17.6. (CVE-2021-21300)

Affected Packages:

git

Issue Correction:
Run yum update git to update your system.

New Packages:

i686:  
    git-core-2.18.5-2.73.amzn1.i686  
    git-instaweb-2.18.5-2.73.amzn1.i686  
    git-debuginfo-2.18.5-2.73.amzn1.i686  
    git-subtree-2.18.5-2.73.amzn1.i686  
    git-daemon-2.18.5-2.73.amzn1.i686  
    git-svn-2.18.5-2.73.amzn1.i686  
    git-2.18.5-2.73.amzn1.i686  
  
noarch:  
    perl-Git-2.18.5-2.73.amzn1.noarch  
    git-p4-2.18.5-2.73.amzn1.noarch  
    perl-Git-SVN-2.18.5-2.73.amzn1.noarch  
    git-cvs-2.18.5-2.73.amzn1.noarch  
    git-email-2.18.5-2.73.amzn1.noarch  
    git-hg-2.18.5-2.73.amzn1.noarch  
    emacs-git-el-2.18.5-2.73.amzn1.noarch  
    gitweb-2.18.5-2.73.amzn1.noarch  
    git-bzr-2.18.5-2.73.amzn1.noarch  
    git-all-2.18.5-2.73.amzn1.noarch  
    emacs-git-2.18.5-2.73.amzn1.noarch  
    git-core-doc-2.18.5-2.73.amzn1.noarch  
  
src:  
    git-2.18.5-2.73.amzn1.src  
  
x86_64:  
    git-subtree-2.18.5-2.73.amzn1.x86_64  
    git-2.18.5-2.73.amzn1.x86_64  
    git-core-2.18.5-2.73.amzn1.x86_64  
    git-debuginfo-2.18.5-2.73.amzn1.x86_64  
    git-daemon-2.18.5-2.73.amzn1.x86_64  
    git-svn-2.18.5-2.73.amzn1.x86_64  
    git-instaweb-2.18.5-2.73.amzn1.x86_64  

Additional References

Red Hat: CVE-2021-21300

Mitre: CVE-2021-21300