OSV-2018-109 Heap-use-after-free in ssl_get_prev_session
A heap-use-after-free in OpenSSL's TLS session handling allows remote attackers to cause denial of service or potentially execute code.
- 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-2018-109?
OSV-2018-109 is an use after free vulnerability in openssl, published on 13 Jan 2021. 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=8241
Crash type: Heap-use-after-free READ 4
Crash state:
ssl_get_prev_session
tls_early_post_process_client_hello
tls_post_process_client_hello
Which versions are affected by OSV-2018-109?
1 open source package ship an affected version, including openssl.
| Package | Affected | Fixed in |
|---|---|---|
openssl OSS-Fuzz | All versions | None |
How do I fix OSV-2018-109?
No fix has been published for OSV-2018-109 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is OSV-2018-109 being exploited?
There is no known exploitation of OSV-2018-109 in the wild and no public exploit code.