Description
NSIS (Nullsoft Scriptable Install System) 3.06.1 before 3.12 sometimes uses the Low IL temp directory when executing as SYSTEM, allowing local attackers to gain privileges (if they can cause my_GetTempFileName to return 0, as shown in the references).
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Nullsoft | Nullsoft Scriptable Install System | 3.06.1 – < 3.12 | 3.12 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | nsis | 3.12-1 | — |
| Debian 13 | nsis | No fix yet | — |
| Debian 12 | nsis | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | nsis | No fix yet | — |
| Ubuntu 26.04 LTS | nsis | No fix yet | — |
| Ubuntu 25.10 | nsis | No fix yet | — |
| Ubuntu 24.04 LTS | nsis | No fix yet | — |
| Ubuntu 22.04 LTS | nsis | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | nsis | No fix yet | — |
| Ubuntu 18.04 LTS | nsis | No fix yet | — |
| Ubuntu 16.04 LTS | nsis | No fix yet | — |
| Ubuntu Pro 14.04 LTS | nsis | No fix yet | — |
References
- https://nsis.sourceforge.io/Docs/AppendixF.html#v3.12-cl
- https://github.com/NSIS-Dev/nsis/commit/8e6f02205d5f22da6c7855dbfe59b2af667330ca
- https://github.com/NSIS-Dev/nsis/blob/7359413009afd4f0fff472d841fc2f2cc0e0a5f8/Source/exehead/util.c#L475-L484
- https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-gettempfilename