Package Instance

Incorrect Regular Expression
sshpk is vulnerable to ReDoS when parsing maliciously crafted invalid public keys.

Improper Input Validation
index.js in brace-expansion before 1.1.7 is vulnerable to Regular Expression Denial of Service (ReDoS) attacks, as demonstrated by an expand argument containing many comma characters.

Time-of-check Time-of-use (TOCTOU) Race Condition in chownr
A TOCTOU issue in the chownr package before 1.1.0 for Node.js 10.10 could allow a local attacker to trick it into descending into unintended directories via symlink attacks.

Arbitrary File Write in npm
Versions of the npm CLI prior to 6.13.3 are vulnerable to an Arbitrary File Write. It fails to prevent access to folders outside of the intended node_modules folder through the bin field. A properly constructed entry in the package.json bin field would allow a package publisher to create files on a user's system when the package is installed. It is only possible to affect files that the user running `npm install` has access to and it is not possible to over write files that already exist on disk.

This behavior is still possible through install scripts. This vulnerability bypasses a user using the --ignore-scripts install option.


## Recommendation

Upgrade to version 6.13.3 or later.

Improper Input Validation
The utilities function in all versions of the deep-extend node module can be tricked into modifying the prototype of `Object` when the attacker can control part of the structure passed to this function. This can let an attacker add or modify existing properties that will exist on all objects.

npm symlink reference outside of node_modules
Versions of the npm CLI prior to 6.13.3 are vulnerable to a symlink reference outside of node_modules. It is possible for packages to create symlinks to files outside of the`node_modules` folder through the `bin` field upon installation. A properly constructed entry in the package.json bin field would allow a package publisher to create a symlink pointing to arbitrary files on a user’s system when the package is installed. Only files accessible by the user running the `npm install` are affected.  

This behavior is still possible through install scripts. This vulnerability bypasses a user using the --ignore-scripts install option.


## Recommendation

Upgrade to version 6.13.3 or later.

npm Vulnerable to Global node_modules Binary Overwrite
Versions of  the npm CLI prior to 6.13.4 are vulnerable to a Global node_modules Binary Overwrite. It fails to prevent existing globally-installed binaries to be overwritten by other package installations. 

For example, if a package was installed globally and created a `serve` binary, any subsequent installs of packages that also create a `serve` binary would overwrite the first binary. This will not overwrite system binaries but only binaries put into the global node_modules directory.

This behavior is still allowed in local installations and also through install scripts. This vulnerability bypasses a user using the --ignore-scripts install option.


## Recommendation

Upgrade to version 6.13.4 or later.