CVE-2020-35452 mod_auth_digest possible stack overflow by one nul byte
A specially crafted Digest nonce can cause a stack overflow in Apache HTTP Server's mod_auth_digest, potentially leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-35452?
CVE-2020-35452 is a high-severity memory corruption vulnerability in Apache Http Server, published on 10 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team could create one, though some particular compiler and/or compilation option might make it possible, with limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow
Weakness: CWE-787
Which versions are affected by CVE-2020-35452?
1 open source package ship an affected version, including apache. It affects 6 products.
| Package | Affected | Fixed in |
|---|---|---|
apache Bitnami | From 2.4.0 | 2.4.47 |
Products include Apache Http Server, Debian Debian Linux, Fedoraproject Fedora, Oracle Enterprise Manager Ops Center, Oracle Instantis Enterprisetrack, Oracle Zfs Storage Appliance Kit.
How do I fix CVE-2020-35452?
Upgrade apache to 2.4.47 or later.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-35452 being exploited?
There is no known exploitation of CVE-2020-35452 in the wild and no public exploit code.
Other vulnerabilities in Apache Http Server
Sources
Also known as ALPINE-CVE-2020-35452, AZL-6475, BIT-apache-2020-35452, CLEANSTART-2026-DX94657, CLSA-2021-1633601543, CLSA-2021-1634922624 and 4 more.