OSV-2020-504 Global-buffer-overflow in lwan_parse_rfc_time
A global buffer overflow in the Lwan web server's time parsing function allows remote attackers to cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2020-504?
OSV-2020-504 is a memory corruption vulnerability in lwan, published on 1 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=14297
Crash type: Global-buffer-overflow READ 4
Crash state:
lwan_parse_rfc_time
parse_if_modified_since
fuzz_parse_http_request
Which versions are affected by OSV-2020-504?
1 open source package ship an affected version, including lwan.
| Package | Affected | Fixed in |
|---|---|---|
lwan OSS-Fuzz | All versions | None |
How do I fix OSV-2020-504?
No fix has been published for OSV-2020-504 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-2020-504 being exploited?
There is no known exploitation of OSV-2020-504 in the wild and no public exploit code.