جزئیات آسیبپذیری
CVE-2026-26955
FreeRDP has Out-of-bounds Write
شرح رسمی (انگلیسی)
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, a malicious RDP server can trigger a heap buffer overflow in FreeRDP clients using the GDI surface pipeline (e.g., `xfreerdp`) by sending an RDPGFX ClearCodec surface command with an out-of-bounds destination rectangle. The `gdi_SurfaceCommand_ClearCodec()` handler does not call `is_within_surface()` to validate the command rectangle against the destination surface dimensions, allowing attacker-controlled `cmd->left`/`cmd->top` (and subcodec rectangle offsets) to reach image copy routines that write into `surface->data` without bounds enforcement. The OOB write corrupts an adjacent `gdiGfxSurface` struct's `codecs*` pointer with attacker-controlled pixel data, and corruption of `codecs*` is sufficient to reach an indirect function pointer call (`NSC_CONTEXT.decode` at `nsc.c:500`) on a subsequent codec command — full instruction pointer (RIP) control demonstrated in exploitability harness. Users should upgrade to version 3.23.0 to receive a patch.
امتیازهای CVSS
| امتیاز | نسخه | منبع | بردار |
|---|---|---|---|
| 8.8بالا | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| 8.8بالا | 3.1 | CVEProject cvelistV5 (CNA) (redhat-SADP) | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
محصولات آسیبپذیر
| فروشنده | محصول | نسخهها | منبع |
|---|---|---|---|
| FreeRDP | FreeRDP | < 3.23.0 | CVEProject cvelistV5 (CNA) |
منابع و راهنماها
۱۹- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mr6w-ch7c-mqqj x_refsource_CONFIRM
- https://github.com/FreeRDP/FreeRDP/commit/7d8fdce2d0ef337cb86cb37fc0c436c905e04d77 x_refsource_MISC
- https://access.redhat.com/security/cve/CVE-2026-26955 vdb-entryx_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2443132 issue-trackingx_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26955.json x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:7292 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:5936 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:5939 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:19033 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:6005 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:6712 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:6616 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:6665 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:6764 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:6395 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:6396 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:6384 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:6385 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:6004 vendor-advisoryx_refsource_REDHAT
اطلاعات
- تاریخ انتشار
- ۱۴۰۴/۱۲/۰۷
- آخرین بهروزرسانی
- ۱۴۰۵/۰۴/۲۴
- وضعیت
- منتشرشده
- صادرکننده (CNA)
- GitHub_M
پیشبینی بهرهبرداری (EPSS)
ارزیابی SSVC (CISA)
- قابل خودکارسازی
- خیر
- وضعیت بهرهبرداری
- اثبات مفهوم
- اثر فنی
- کامل
ضعفها (CWE)
- CWE-787Out-of-bounds Write
- CWE-805Buffer Access with Incorrect Length Value