CVE-2024-6197

Vulnerability 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 Score

Affected Products

References

• http://www.openwall.com/lists/oss-security/2024/07/24/1Mailing ListThird Party Advisory
• http://www.openwall.com/lists/oss-security/2024/07/24/5Mailing ListThird Party Advisory
• https://curl.se/docs/CVE-2024-6197.htmlVendor Advisory
• https://curl.se/docs/CVE-2024-6197.jsonVendor Advisory
• https://hackerone.com/reports/2559516ExploitIssue TrackingTechnical Description
• http://www.openwall.com/lists/oss-security/2024/07/24/1Mailing ListThird Party Advisory
• http://www.openwall.com/lists/oss-security/2024/07/24/5Mailing ListThird Party Advisory
• https://curl.se/docs/CVE-2024-6197.htmlVendor Advisory
• https://curl.se/docs/CVE-2024-6197.jsonVendor Advisory
• https://hackerone.com/reports/2559516ExploitIssue TrackingTechnical Description
• https://security.netapp.com/advisory/ntap-20241129-0008/