CVE-2020-15904 bsdiff4 out-of-bounds write via patch file
A buffer overflow in the bsdiff4 library allows attackers to write to heap memory via crafted patch files, potentially leading to code execution.
- 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
- Available
What is CVE-2020-15904?
CVE-2020-15904 is a high-severity memory corruption vulnerability in n/a, published on 22 Jul 2020. 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
A buffer overflow in the patching routine of bsdiff4 before 1.2.0 allows an attacker to write to heap memory (beyond allocated bounds) via a crafted patch file.
Weakness: CWE-787
Which versions are affected by CVE-2020-15904?
3 open source packages ship an affected version, including bsdiff4. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
bsdiff4 PyPI | All versions | 1.2.0 |
bsdiff4 PyPI | All versions | 1.2.0 |
bsdiff4 PyPI | All versions | 1.2.0 |
Products include Pypi Bsdiff4.
How do I fix CVE-2020-15904?
Upgrade bsdiff4 to 1.2.0 or later.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-15904 being exploited?
There is no known exploitation of CVE-2020-15904 in the wild and no public exploit code.
Sources
Also known as GHSA-f8m3-jpxr-hm5x, PYSEC-2020-30.