An issue was discovered in Qt before 5.15.15, 6.x before 6.2.9, and 6.3.x through 6.5.x before 6.5.1. When a SVG file with an image inside it is rendered, a QTextLayout buffer overflow can be triggered.

Apache Ozone could allow a remote authenticated attacker to bypass security restrictions, caused by improper authentication of an HTTP endpoint in the S3 Gateway. By sending a specially crafted request, an attacker could exploit this vulnerability to revoke and regenerate the S3 secrets of any other user.

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

A use-after-free exists in Python through 3.9 via heappushpop in heapq.