CVE-2020-24722 Other in n/a
Attackers can deanonymize users and inflate risk scores in COVID-19 apps by exploiting missing checksums in the GAEN protocol metadata.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-24722?
CVE-2020-24722 is a medium-severity vulnerability in n/a, published on 7 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-10-05, as used in COVID-19 applications on Android and iOS. The encrypted metadata block with a TX value lacks a checksum, allowing bitflipping to amplify a contamination attack. This can cause metadata deanonymization and risk-score inflation. NOTE: the vendor's position is "We do not believe that TX power authentication would be a useful defense against relay attacks.
Weakness: CWE-294
Which versions are affected by CVE-2020-24722?
It affects 1 product.
Products include Exposure Notifications Project Exposure Notifications.
How do I fix CVE-2020-24722?
No fix has been published for CVE-2020-24722 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-24722 being exploited?
There is no known exploitation of CVE-2020-24722 in the wild and no public exploit code.
Sources
Also known as GHSA-2gfr-hjcw-mr7q.