CVE-2024-6197

July 24, 2024, 9:15 p.m.

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.

Weaknesses

Date

Published: July 24, 2024, 8:15 a.m.

Last Modified: July 24, 2024, 9:15 p.m.

Status : Undergoing Analysis

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

2499f714-1537-4658-8207-48ae4bb9eae9

References

http://www.openwall.com/lists/oss-security/2024/07/24/1
2499f714-1537-4658-8207-48ae4bb9eae9
http://www.openwall.com/lists/oss-security/2024/07/24/5
2499f714-1537-4658-8207-48ae4bb9eae9
https://curl.se/docs/CVE-2024-6197.html
2499f714-1537-4658-8207-48ae4bb9eae9
https://curl.se/docs/CVE-2024-6197.json
2499f714-1537-4658-8207-48ae4bb9eae9
https://hackerone.com/reports/2559516
2499f714-1537-4658-8207-48ae4bb9eae9