Out-of-bounds Read in Nanopb
CVE-2020-5235
There is a potentially exploitable out of memory condition In Nanopb before 0.4.1, 0.3.9.5, and 0.2.9.4. When nanopb is compiled with PB_ENABLE_MALLOC, the message to be decoded contains a repeated string, bytes or message field and realloc() runs out of memory when expanding the array nanopb can end up calling `free()` on a pointer value that comes from uninitialized memory. Depending on platform this can result in a crash or further memory corruption, which may be exploitable in some cases. This problem is fixed in nanopb-0.4.1, nanopb-0.3.9.5, nanopb-0.2.9.4.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.017 (76.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000
Affected products
- Nanopb — versions < 0.2.9.4, >= 0.3.0, < 0.3.9.5, >= 0.4.0, < 0.4.1
- Nanopb Project
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/nanopb/nanopb/security/advisories/GHSA-gcx3-7m76-287p (Patch, Third Party Advisory)
- github.com/nanopb/nanopb/commit/45582f1f97f49e2abfdba1463d1e1027682d9856 (Patch, Third Party Advisory)
- github.com/nanopb/nanopb/commit/7b396821ddd06df8e39143f16e1dc0a4645b89a3 (Patch, Third Party Advisory)
- github.com/nanopb/nanopb/commit/aa9d0d1ca78d6adec3adfeecf3a706c7f9df81f2 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-5235?
- CVE-2020-5235 is a medium-severity vulnerability in Nanopb, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2020-02-04.
- How severe is CVE-2020-5235?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2020-5235 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.