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| Who | When | What | Removed | Added |
|---|---|---|---|---|
| Marian Rehak | 2023-06-09 07:04:56 UTC | CC | security-response-team | |
| Marian Rehak | 2023-06-09 07:08:23 UTC | Blocks | 2213750 | |
| Sandipan Roy | 2023-06-09 08:22:20 UTC | Blocks | 2213750 | |
| Sandipan Roy | 2023-06-09 08:22:38 UTC | Blocks | 2213123 | |
| Sandipan Roy | 2023-06-09 08:40:33 UTC | Summary | EMBARGOED CVE-2023-3138 libX11: buffer overflows in InitExt.c | EMBARGOED CVE-2023-3138 libX11: InitExt.c can overwrite unintended portions of the Display structure if the extension request leads to a buffer overflow |
| Sandipan Roy | 2023-06-09 08:43:31 UTC | Doc Text | A vulnerability was found in libX11. The security flaw ouccers becuase of the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. Instead they trusted that they were called with values provided by an Xserver that was adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself. Testing has found it is possible to at least cause the client to crash with this memory corruption. |
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| Sandipan Roy | 2023-06-09 08:43:48 UTC | Depends On | 2213763, 2213762 | |
| RaTasha Tillery-Smith | 2023-06-09 12:16:25 UTC | Doc Text | A vulnerability was found in libX11. The security flaw ouccers becuase of the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. Instead they trusted that they were called with values provided by an Xserver that was adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself. Testing has found it is possible to at least cause the client to crash with this memory corruption. | A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption. |
| Guilherme de Almeida Suckevicz | 2023-06-15 18:31:57 UTC | Deadline | 2023-06-15 | |
| Group | security, qe_staff | |||
| Summary | EMBARGOED CVE-2023-3138 libX11: InitExt.c can overwrite unintended portions of the Display structure if the extension request leads to a buffer overflow | CVE-2023-3138 libX11: InitExt.c can overwrite unintended portions of the Display structure if the extension request leads to a buffer overflow | ||
| Guilherme de Almeida Suckevicz | 2023-06-15 18:32:10 UTC | Depends On | 2215372 | |
| Niels De Graef | 2023-06-19 15:38:15 UTC | CC | ndegraef | |
| Red Hat Bugzilla | 2023-07-07 08:31:43 UTC | Assignee | security-response-team | nobody |
| CC | security-response-team |
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