browserify-sign is a package to duplicate the functionality of node's crypto public key functions, much of this is based on Fedor Indutny's work on indutny/tls.js. An upper bound check issue in `dsaVerify` function allows an attacker to construct signatures that can be successfully verified by any public key, thus leading to a signature forgery attack. All places in this project that involve DSA verification of user-input signatures will be affected by this vulnerability. This issue has been patched in version 4.2.2.
Affected: npm: browserify-sign
### Summary An upper bound check issue in `dsaVerify` function allows an attacker to construct signatures that can be successfully verified by any public key, thus leading to a signature forgery attack.
### Details In `dsaVerify` function, it checks whether the value of the signature is legal by calling function `checkValue`, namely, whether `r` and `s` are both in the interval `[1, q - 1]`. However, the second line of the `checkValue` function wrongly checks the upper bound of the passed parameters, since the value of `b.cmp(q)` can only be `0`, `1` and `-1`, and it can never be greater than `q`.
In this way, although the values of `s` cannot be `0`, an attacker can achieve the same effect as zero by setting its value to `q`, and then send `(r, s) = (1, q)` to pass the verification of any public key.
### Impact All places in this project that involve DSA verification of user-input signatures will be affected by this vulnerability.
### Fix PR: Since the temporary private fork was deleted, here's a webarchive of the PR discussion and diff pages: [PR webarchive.zip](https://github.com/browserify/browserify-sign/files/13172957/PR.webarchive.zip)
velociraptor-0.7.0.4.git142.862ef23-1.1 on GA media
browserify-sign: upper bound check issue in dsaVerify leads to a signature forgery attack send: Code Execution Vulnerability in Send Library
Affected: Ubuntu:Pro:18.04:LTS: node-browserify-sign, Ubuntu:20.04:LTS: node-browserify-sign, Ubuntu:22.04:LTS: node-browserify-sign
browserify-sign is a package to duplicate the functionality of node's crypto public key functions, much of this is based on Fedor Indutny's work on indutny/tls.js. An upper bound check issue in `dsaVerify` function allows an attacker to construct signatures that can be successfully verified by any public key, thus leading to a signature forgery attack. All places in this project that involve DSA verification of user-input signatures will be affected by this vulnerability. This issue has been patched in version 4.2.2.
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Red Hat OpenShift distributed tracing ausnutzen, um Sicherheitsvorkehrungen zu umgehen.