CWE-208

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    "severity": "MODERATE"
  },
  "details": "## Summary\n\nvalidateUser() in backend/src/authentication/providers/mysql/auth-provider-mysql.service.ts returns immediately when the supplied login/email does not match any account, without ever calling comparePassword():\n\n    async validateUser(loginOrEmail: string, password: string, ip?: string, scope?: AUTH_SCOPE): Promise\u003cUserModel\u003e {\n      let user: UserModel\n      try {\n        user = await this.usersManager.findUser(loginOrEmail, false)\n      } catch (e) { ... }\n      if (!user) {\n        this.logger.warn(...)\n        return null   // \u003c-- comparePassword() is never reached here\n      }\n      return await this.usersManager.logUser(user, password, ip, scope)\n    }\n\ncomparePassword() (backend/src/common/functions.ts) already contains a dummy-hash branch that was clearly added to defend against exactly this class of attack:\n\n    export async function comparePassword(password: string, hash?: string | null): Promise\u003cboolean\u003e {\n      if (!hash) {\n        // No hash, waste time for time-based attacks\n        await bcrypt.compare(password, DUMMY_PASSWORD_HASH)\n        return false\n      }\n      return await bcrypt.compare(password, hash)\n    }\n\nThe problem is that this protection only runs when comparePassword() is actually invoked with a falsy hash. Because validateUser() short-circuits with return null as soon as findUser() comes back empty, the \"account doesn\u0027t exist\" path skips all cryptographic work entirely, while the \"account exists, wrong password\" path always performs a real bcrypt comparison (cost factor 10, ~100ms+). The two outcomes are trivially distinguishable by response time.\n\nThere\u0027s already a published advisory in this repo for \"Username Enumeration via Timing Attack\" - this looks like the same underlying issue surfacing through a different call path (the early return in validateUser()) that the existing fix (the dummy-hash branch in comparePassword()) doesn\u0027t actually reach, rather than a brand new vulnerability class.\n\n## Impact\n\nAny unauthenticated client can determine whether a given username/email is a valid account on the instance by timing POST /api/auth/login:\n- Non-existent login: near-instant rejection (no bcrypt call).\n- Existing login (regardless of password correctness): consistently slower due to a real bcrypt comparison.\n\nThis enables efficient enumeration of valid accounts, which can then be used to focus credential-stuffing, password-spraying, or phishing against confirmed-valid targets.\n\n## Proof of Concept\n\nVerified with the actual comparePassword() logic and the real DUMMY_PASSWORD_HASH constant copied verbatim from backend/src/common/functions.ts, using the project\u0027s own bcryptjs dependency (no mocking of bcrypt itself):\n\n    Avg time for \"login does not exist\" path (validateUser returns null, no bcrypt call): 0.00 ms\n    Avg time for \"login exists, wrong password\" path (real bcrypt.compare runs):          114.90 ms\n    Difference: 114.90 ms (ratio: ~58923x)\n\nThe \"not found\" path reproduces validateUser()\u0027s exact early return (no call into comparePassword); the \"wrong password\" path reproduces logUser()\u0027s real call into comparePassword(password, user.password). The gap is large enough to be trivially observable over a real network, even accounting for jitter.\n\nReachable endpoint: POST /api/auth/login, guarded only by AuthLocalGuard (Passport local strategy invoking validateUser()), no authentication required.\n\n## Suggested fix\n\nMake validateUser() always pass through comparePassword()\u0027s timing-equalized path, even when no user is found, e.g.:\n\n    if (!user) {\n      await comparePassword(password, null) // burns the same time as a real comparison\n      return null\n    }\n\nso the \"account not found\" and \"account found, wrong password\" branches take statistically indistinguishable time.",
  "id": "GHSA-29hq-23m2-2j47",
  "modified": "2026-09-22T14:49:23Z",
  "published": "2026-09-22T14:49:23Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Sync-in/server/security/advisories/GHSA-29hq-23m2-2j47"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-58272"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Sync-in/server/commit/b80efe04574039a7a302c0e1007f03a7dbe6a633"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Sync-in/server"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Sync-in/server/releases/tag/v2.4.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Sync-in Server has Username/Login Enumeration via Timing Side-Channel on POST /api/auth/login (incomplete fix of the prior timing-attack advisory)"
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "cmov"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.4.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-23519"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-203",
      "CWE-208"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-15T18:17:15Z",
    "nvd_published_at": "2026-01-15T20:16:05Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\n`thumbv6m-none-eabi` (Cortex M0, M0+ and M1) compiler emits non-constant time assembly when using `cmovnz` (portable version). I did not found any other target with the same behaviour but I did not go through all targets supported by Rust. \n\n### Details\n\nIt seems that, [during `mask` computation](https://github.com/RustCrypto/utils/blob/9e555db060c80f4669d804f448a524a37d201b32/cmov/src/portable.rs#L78), an LLVM optimisation pass is detecting that [`bitnz`](https://github.com/RustCrypto/utils/blob/9e555db060c80f4669d804f448a524a37d201b32/cmov/src/portable.rs#L13) is returning 0 or 1, that can be interpreted as a boolean. This intermediate value is not masked by a call to `black_box` and thus the subsequent [`.wrapping_sub(1)`](https://github.com/RustCrypto/utils/blob/9e555db060c80f4669d804f448a524a37d201b32/cmov/src/portable.rs#L78C1-L78C84) can be interpreted as a conditional bitwise conditional not.\n\n### PoC\n\nThis is an attempt at having a minimal faulty code. In a library crate with an up-to-date `cmov` as only dependency, the content of `src/lib.rs` is:\n\n```rust\n#![no_std]\nuse cmov::Cmov;\n\n#[inline(never)]\npub fn test_ct_cmov(a: \u0026mut u8, b: u8, c: u8) {\n    a.cmovnz(\u0026b, c);\n}\n```\n\n\nThe resulting assembly emitted (shown using `cargo asm --release --target thumbv6m-none-eabi` that uses [`cargo-show-asm`](https://crates.io/crates/cargo-show-asm)):\n\n\u003cdetails\u003e\n\u003csummary\u003eCollapsed assembly\u003c/summary\u003e\n\n```asm\n.section .text.not_ct::test_ct_cmov,\"ax\",%progbits\n\t.globl\tnot_ct::test_ct_cmov\n\t.p2align\t1\n\t.type\tnot_ct::test_ct_cmov,%function\n\t.code\t16\n\t.thumb_func\nnot_ct::test_ct_cmov:\n\t.fnstart\n\t.cfi_sections .debug_frame\n\t.cfi_startproc\n\t.save\t{r7, lr}\n\tpush {r7, lr}\n\t.cfi_def_cfa_offset 8\n\t.cfi_offset lr, -4\n\t.cfi_offset r7, -8\n\t.setfp\tr7, sp\n\tadd r7, sp, #0\n\t.cfi_def_cfa_register r7\n\t.pad\t#8\n\tsub sp, #8\n\tmovs r3, #0\n\tlsls r2, r2, #24\n\tbne .LBB0_2\n\tmvns r3, r3\n.LBB0_2:\n\tldrb r2, [r0]\n\tstr r3, [sp, #4]\n\tstr r3, [sp]\n\tmov r3, sp\n\t@APP\n\t@NO_APP\n\tldr r3, [sp]\n\tbics r1, r3\n\tands r2, r3\n\tadds r1, r2, r1\n\tstrb r1, [r0]\n\tadd sp, #8\n\tpop {r7, pc}\n```\n\n\u003c/details\u003e\n\nThe non-constant time assembly is:\n\n```asm\n    bne  .LBB0_2\n    mvns r3, r3\n.LBB0_2:\n```\n\n### Impact\n\nThe exact impact is unclear, especially since `cmov` clearly warns users that the portable version is best-effort.",
  "id": "GHSA-2gqc-6j2q-83qp",
  "modified": "2026-01-23T21:46:10Z",
  "published": "2026-01-15T18:17:15Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/RustCrypto/utils/security/advisories/GHSA-2gqc-6j2q-83qp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23519"
    },
    {
      "type": "WEB",
      "url": "https://github.com/RustCrypto/utils/commit/55977257e7c82a309d5e8abfdd380a774f0f9778"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/RustCrypto/utils"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0003.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "RustCrypto Utilities cmov: `thumbv6m-none-eabi` compiler emits non-constant time assembly when using `cmovnz`"
}