Edge SWG (formerly ProxySG) vulnerability status in respect to CVE-2024-6197.

Products

• ISG Proxy
• ProxySG Software - SGOS

Issue/Introduction

Proxy administrators would like to determine if Edge SWG (formerly ProxySG) devices are vulnerable to CVE-2024-6197.

Environment

Edge SWG (formerly ProxySG)

Cause

Vulnerability Details

• CVE ID Number: CVE-2024-6197
• Component: libcurl's 
• Date Published: July 24th, 2024
• 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.
• Vector Assessment:  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
• Base Score: 7.5 (High)

Advisory Link(s)

• https://curl.se/docs/CVE-2024-6197.html  
• https://nvd.nist.gov/vuln/detail/CVE-2024-6197 

Resolution

Edge SWG (formerly ProxySG) devices are not vulnerable to CVE-2024-6197.