OSV-2021-1771 Stack-buffer-overflow in fn_ElIn_evaluate
A stack buffer overflow in Ghostscript's function evaluation allows attackers to execute arbitrary code or cause denial of service via malicious PDFs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is OSV-2021-1771?
OSV-2021-1771 is a memory corruption vulnerability in ghostscript, published on 28 Dec 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=43012
Crash type: Stack-buffer-overflow WRITE 4
Crash state:
fn_ElIn_evaluate
pdfi_tf_using_function
gs_begin_transparency_mask
Which versions are affected by OSV-2021-1771?
1 open source package ship an affected version, including ghostscript.
| Package | Affected | Fixed in |
|---|---|---|
ghostscript OSS-Fuzz | All versions | None |
How do I fix OSV-2021-1771?
No fix has been published for OSV-2021-1771 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is OSV-2021-1771 being exploited?
There is no known exploitation of OSV-2021-1771 in the wild and no public exploit code.