CVE-2024-6197

Description

libcurl's ASN1 parser has this utf8asn1str() function used for parsing an ASN.1 UTF-8 string. Itcan detect an invalid field and return error. Unfortunately, when doing so it also invokes `free()` on a 4 byte localstack buffer. Most modern malloc implementations detect this error and immediately abort. Some however accept the input pointer and add that memory to its list of available chunks. This leads to the overwriting of nearby stack memory. The content of the overwrite is decided by the `free()` implementation; likely to be memory pointers and a set of flags. The most likely outcome of exploting this flaw is a crash, although it cannot be ruled out that more serious results can be had in special circumstances.

How to fix CVE-2024-6197

To remediate CVE-2024-6197, upgrade the affected package to a fixed version below.

• —upgrade to 8.9.0-r0 or later
• —upgrade to 8.9.0-1 or later

Is CVE-2024-6197 being exploited?

Low — EPSS is 1.3%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 8.9.0-r0
• from 0, < 8.9.0-1

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2024-6197
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2024-6197