CVE-2024-6197
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.30%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 4.30% probability · 91th percentile
- CISA KEV
- Not listed
- Affected
- haxx/libcurl
- Source
- 2499f714-1537-4658-8207-48ae4bb9eae9
References
- http://www.openwall.com/lists/oss-security/2024/07/24/1Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2024/07/24/5Mailing List, Third Party Advisory
- https://curl.se/docs/CVE-2024-6197.htmlVendor Advisory
- https://curl.se/docs/CVE-2024-6197.jsonVendor Advisory
- https://hackerone.com/reports/2559516Exploit, Issue Tracking, Technical Description
- http://www.openwall.com/lists/oss-security/2024/07/24/1Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2024/07/24/5Mailing List, Third Party Advisory
- https://curl.se/docs/CVE-2024-6197.htmlVendor Advisory
- https://curl.se/docs/CVE-2024-6197.jsonVendor Advisory
- https://hackerone.com/reports/2559516Exploit, Issue Tracking, Technical Description
- https://security.netapp.com/advisory/ntap-20241129-0008/
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.