OSV-2020-1136 Global-buffer-overflow in ssl_sigalg
A global buffer overflow in OpenSSL's TLS signature algorithm processing can cause a denial of service via crafted network traffic.
- 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-2020-1136?
OSV-2020-1136 is a memory corruption vulnerability in libressl, published on 22 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=13797
Crash type: Global-buffer-overflow READ 2
Crash state:
ssl_sigalg
tls1_process_sigalgs
tlsext_sigalgs_server_parse
Which versions are affected by OSV-2020-1136?
1 open source package ship an affected version, including libressl.
| Package | Affected | Fixed in |
|---|---|---|
libressl OSS-Fuzz | All versions | None |
How do I fix OSV-2020-1136?
No fix has been published for OSV-2020-1136 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-2020-1136 being exploited?
There is no known exploitation of OSV-2020-1136 in the wild and no public exploit code.