Paper/Archive/CVE-2021-3520

CVE-2021-3520

Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP — There's a flaw in lz4.

CVSS 9.8 (NVD)9.8 / 10 × 3029.4 Not in CISA KEV+300.0 EPSS percentile 88.8.888 × 2017.8 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

There's a flaw in lz4. An attacker who submits a crafted file to an application linked with lz4 may be able to trigger an integer overflow, leading to calling of memmove() on a negative size argument, causing an out-of-bounds write and/or a crash. The greatest impact of this flaw is to availability, with some potential impact to confidentiality and integrity as well.

Affected

ProductAffectedFixed inSource

lz4lz4-1.8.3–CNA

SIMATIC S7-1500 CPU 1518-4 PN/DP MFPV3.1.0 – < V3.1.5V3.1.5siemens-SADP

SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPV3.1.0 – < V3.1.5V3.1.5siemens-SADP

SIPLUS S7-1500 CPU 1518-4 PN/DP MFPV3.1.0 – < V3.1.5V3.1.5siemens-SADP

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refbugzilla.redhat.com/show_bug.cgi?id=1954559 reforacle.com//security-alerts/cpujul2021.html reforacle.com/security-alerts/cpuoct2021.html reforacle.com/security-alerts/cpuapr2022.html refsecurity.netapp.com/advisory/ntap-20211104-0005 refcert-portal.siemens.com/productcert/html/ssa-398330.html