OSV-2018-142 UNKNOWN READ in cff_decoder_parse_charstrings
An attacker can cause a denial of service via an unknown read in the FreeType font library when parsing malformed CFF charstrings.
- 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-2018-142?
OSV-2018-142 is a memory corruption vulnerability in freetype2, 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=11157
Crash type: UNKNOWN READ
Crash state:
cff_decoder_parse_charstrings
cff_slot_load
FT_Load_Glyph
Which versions are affected by OSV-2018-142?
1 open source package ship an affected version, including freetype2.
| Package | Affected | Fixed in |
|---|---|---|
freetype2 OSS-Fuzz | All versions | None |
How do I fix OSV-2018-142?
No fix has been published for OSV-2018-142 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-2018-142 being exploited?
There is no known exploitation of OSV-2018-142 in the wild and no public exploit code.