From 680ed842a11285f74db9b832ed2680365aa0743e Mon Sep 17 00:00:00 2001 From: Vincent Biret Date: Mon, 17 Aug 2026 11:50:54 -0400 Subject: [PATCH] Improve GHSA-3hrf-2gc2-mx32 --- .../2026/07/GHSA-3hrf-2gc2-mx32/GHSA-3hrf-2gc2-mx32.json | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/advisories/github-reviewed/2026/07/GHSA-3hrf-2gc2-mx32/GHSA-3hrf-2gc2-mx32.json b/advisories/github-reviewed/2026/07/GHSA-3hrf-2gc2-mx32/GHSA-3hrf-2gc2-mx32.json index 7db9e39c0c8..b65b4710a44 100644 --- a/advisories/github-reviewed/2026/07/GHSA-3hrf-2gc2-mx32/GHSA-3hrf-2gc2-mx32.json +++ b/advisories/github-reviewed/2026/07/GHSA-3hrf-2gc2-mx32/GHSA-3hrf-2gc2-mx32.json @@ -1,13 +1,13 @@ { "schema_version": "1.4.0", "id": "GHSA-3hrf-2gc2-mx32", - "modified": "2026-08-17T14:52:01Z", + "modified": "2026-08-17T14:52:02Z", "published": "2026-07-24T15:30:47Z", "aliases": [ "CVE-2026-59860" ], "summary": "Microsoft Kiota: XML Doc-Comment Newline Breakout Code Injection", - "details": "### Summary\n\nKiota versions **prior to 1.32.3 and 1.29.1** are affected by a code-generation injection vulnerability in the C# XML documentation-comment sink (the `description`, `externalDocs` label, and `externalDocs` link fields emitted as `/// …` comments).\n\nWhen text from an OpenAPI description is written into single-line XML doc comments without stripping newline and Unicode line-terminator characters, an attacker can break out of the `///` comment line and inject additional code into generated C# clients.\n\n## Impact and Preconditions\n\nThis issue is only practically exploitable when:\n\n1. the OpenAPI description used for generation is from an **untrusted source**, or\n2. a normally trusted OpenAPI description has been **compromised/tampered with**.\n\nThe injected code is compiled (and may execute) when the developer or CI **builds** the generated client. If you only generate from trusted, integrity-protected API descriptions, risk is significantly reduced.\n\n## Affected Versions\n\n- **Affected:** all versions **< 1.29.1**, **>= 1.30.0, < 1.32.3**\n- **Fixed: 1.29.1, 1.32.3,** and later\n\n## Illustrative Exploit Example\n\n### Example OpenAPI fragment (malicious description)\n\n```yaml\nopenapi: 3.0.1\ninfo:\n title: Exploit Demo\n version: 1.0.0\n description: |-\n Legitimate summary text\n public static class Pwned { static Pwned() { System.Diagnostics.Process.Start(\"calc.exe\"); } }\n```\n\nThe newline inside `description` (also exploitable via `\\r`, U+0085, U+2028, U+2029) terminates the doc-comment line.\n\n### Example generated C# snippet before fix (illustrative)\n\n```csharp\n/// Legitimate summary text\npublic static class Pwned { static Pwned() { System.Diagnostics.Process.Start(\"calc.exe\"); } }\n```\n\nThe injected payload escapes the intended `///` comment context and introduces attacker-controlled statements in generated code.\n\n> Note: this exploit is not limited to the `description` field, but may also impact the `externalDocs` label and link text and other doc-comment-derived locations.\n\n## Remediation\n\n1. Upgrade Kiota to **1.32.3 or later**.\n2. Regenerate/refresh existing generated clients as a precaution:\n\nRefreshing generated clients ensures previously generated vulnerable code is replaced with hardened output. The fix (PR microsoft/kiota#7831) strips `\\r`, `\\n`, `\\u0085`, `\\u2028`, `\\u2029` (and normalizes tabs) from description, label, and link text before emitting doc comments.", + "details": "### Summary\n\nKiota versions **prior to 1.32.3** are affected by a code-generation injection vulnerability in the C# XML documentation-comment sink (the `description`, `externalDocs` label, and `externalDocs` link fields emitted as `/// …` comments).\n\nWhen text from an OpenAPI description is written into single-line XML doc comments without stripping newline and Unicode line-terminator characters, an attacker can break out of the `///` comment line and inject additional code into generated C# clients.\n\n## Impact and Preconditions\n\nThis issue is only practically exploitable when:\n\n1. the OpenAPI description used for generation is from an **untrusted source**, or\n2. a normally trusted OpenAPI description has been **compromised/tampered with**.\n\nThe injected code is compiled (and may execute) when the developer or CI **builds** the generated client. If you only generate from trusted, integrity-protected API descriptions, risk is significantly reduced.\n\n## Affected Versions\n\n- **Affected:** all versions **< 1.32.3**\n- **Fixed: 1.32.3** and later\n\n## Illustrative Exploit Example\n\n### Example OpenAPI fragment (malicious description)\n\n```yaml\nopenapi: 3.0.1\ninfo:\n title: Exploit Demo\n version: 1.0.0\n description: |-\n Legitimate summary text\n public static class Pwned { static Pwned() { System.Diagnostics.Process.Start(\"calc.exe\"); } }\n```\n\nThe newline inside `description` (also exploitable via `\\r`, U+0085, U+2028, U+2029) terminates the doc-comment line.\n\n### Example generated C# snippet before fix (illustrative)\n\n```csharp\n/// Legitimate summary text\npublic static class Pwned { static Pwned() { System.Diagnostics.Process.Start(\"calc.exe\"); } }\n```\n\nThe injected payload escapes the intended `///` comment context and introduces attacker-controlled statements in generated code.\n\n> Note: this exploit is not limited to the `description` field, but may also impact the `externalDocs` label and link text and other doc-comment-derived locations.\n\n## Remediation\n\n1. Upgrade Kiota to **1.32.3 or later**.\n2. Regenerate/refresh existing generated clients as a precaution:\n\nRefreshing generated clients ensures previously generated vulnerable code is replaced with hardened output. The fix (PR microsoft/kiota#7831) strips `\\r`, `\\n`, `\\u0085`, `\\u2028`, `\\u2029` (and normalizes tabs) from description, label, and link text before emitting doc comments.", "severity": [ { "type": "CVSS_V4", @@ -56,7 +56,7 @@ { "package": { "ecosystem": "NuGet", - "name": "Microsoft.OpenApi.Kiota" + "name": "Microsoft.OpenApi.Kiota.Builder" }, "ranges": [ { @@ -75,7 +75,7 @@ { "package": { "ecosystem": "NuGet", - "name": "Microsoft.OpenApi.Kiota.Builder" + "name": "Microsoft.OpenApi.Kiota" }, "ranges": [ {