high
7.5
CWE
347
Advisory Published
CVE Published
Advisory Published
Updated

CVE-2023-46234: browserify-sign vulnerable via an upper bound check issue in `dsaVerify` that leads to a signature forgery attack

First published: Thu Oct 26 2023(Updated: )

### 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)

Credit: security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
debian/node-browserify-sign<=4.2.1-1<=4.2.1-3
4.2.2-1
4.2.1-3+deb12u1
4.2.1-1+deb11u1
redhat/browserify-sign<4.2.2
4.2.2
npm/browserify-sign>=2.6.0<=4.2.1
4.2.2
Browserify Browserify-sign<4.2.2
Debian Debian Linux=11.0
Debian Debian Linux=12.0
debian/node-browserify-sign<=4.0.4-2
4.0.4-2+deb10u1
4.2.1-1+deb11u1
4.2.1-3+deb12u1
4.2.2-1
ubuntu/node-browserify-sign<4.0.4-2ubuntu0.18.04.1~
4.0.4-2ubuntu0.18.04.1~
ubuntu/node-browserify-sign<4.0.4-2ubuntu0.20.04.1
4.0.4-2ubuntu0.20.04.1
ubuntu/node-browserify-sign<4.2.1-2ubuntu0.1
4.2.1-2ubuntu0.1
ubuntu/node-browserify-sign<4.2.1-3ubuntu0.1
4.2.1-3ubuntu0.1
<4.2.2
=11.0
=12.0

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Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2023-46234?

    CVE-2023-46234 is a vulnerability in the browserify-sign package that allows an attacker to construct signatures which can be successfully verified by any public key, leading to a signature forgery attack.

  • How does CVE-2023-46234 work?

    CVE-2023-46234 works by exploiting an upper bound check issue in the dsaVerify function of the browserify-sign package.

  • What is the severity rating of CVE-2023-46234?

    CVE-2023-46234 has a severity rating of 7.5 (high).

  • Which software is affected by CVE-2023-46234?

    The browserify-sign package with versions 2.6.0 to 4.2.1 (inclusive) is affected by CVE-2023-46234.

  • How can I fix CVE-2023-46234?

    To fix CVE-2023-46234, update the browserify-sign package to version 4.2.2 or higher.

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