Buffer overflow in Serenityos
CVE-2019-20172
Kernel/VM/MemoryManager.cpp in SerenityOS before 2019-12-30 does not reject syscalls with pointers into the kernel-only virtual address space, which allows local users to gain privileges by overwriting a return address that was found on the kernel stack.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (38.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/SerenityOS/serenity/commit/0fc24fe2564736689859e7edfa177a86dac36bf9 (Patch, Third Party Advisory)
- github.com/Fire30/CTF-WRITEUPS/tree/master/36c3_ctf/wisdom (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-20172?
- CVE-2019-20172 is a high-severity vulnerability in Serenityos, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2019-12-31.
- How severe is CVE-2019-20172?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2019-20172 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.