CVE-2024-6197

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.

Affected products

Alt Linux, Astra Linux, Red Os, Suse, Windows, Libcurl

Haxx Libcurl

< 8.9.0

CVSS 3.1

7.5 HIGH

EPSS

4.3% (90th percentile)

NVD status

Modified

Published

2024-07-24

No exploit for CVE-2024-6197 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.