OSV-2018-143 Global-buffer-overflow in CFF::BlendArg::set_blends
A global buffer overflow in the CFF font parser allows attackers to cause denial of service or potentially execute code via malicious font files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is OSV-2018-143?
OSV-2018-143 is a memory corruption vulnerability in harfbuzz, published on 13 Jan 2021. An attacker can exploit it over the internet without logging in, 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=11714
Crash type: Global-buffer-overflow READ 8
Crash state:
CFF::BlendArg::set_blends
CFF::CFF2CSOpSet<CFF2CSOpSet_SubrSubset, CFF::SubrSubsetParam, CFF::PathProcsNul
CFF2CSOpSet_SubrSubset::process_op
Which versions are affected by OSV-2018-143?
1 open source package ship an affected version, including harfbuzz.
| Package | Affected | Fixed in |
|---|---|---|
harfbuzz OSS-Fuzz | All versions | None |
How do I fix OSV-2018-143?
No fix has been published for OSV-2018-143 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-2018-143 being exploited?
There is no known exploitation of OSV-2018-143 in the wild and no public exploit code.