CVE Vulnerabilities

CVE-2021-21300

This vulnerability is marked as RESERVED by NVD. This means that the CVE-ID is reserved for future use by the CVE Numbering Authority (CNA) or a security researcher, but the details of it are not yet publicly available yet.

This page will reflect the classification results once they are available through NVD.

Any vendor information available is shown as below.

Redhat

CVE-2021-21300 git: remote code execution during clone operation on case-insensitive filesystems

Mitigation

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.

Ubuntu

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.

Affected Software List

NameVendorVersion
GitUbuntu/bionic1:2.17.1-1ubuntu0.8
GitUbuntu/esm-infra/xenial1:2.7.4-0ubuntu1.10
GitUbuntu/upstreamTBD
GitUbuntu/devel1:2.30.2-1ubuntu1
GitUbuntu/focal1:2.25.1-1ubuntu3.1
GitUbuntu/groovy1:2.27.0-1ubuntu1.1
GitUbuntu/trustyout of standard support
GitUbuntu/xenial1:2.7.4-0ubuntu1.10