CVE-2020-28384

A vulnerability has been identified in Solid Edge SE2020 (All Versions < SE2020MP12), Solid Edge SE2021 (All Versions < SE2021MP2). Affected applications lack proper validation of user-supplied data when parsing PAR files. This could lead to a stack based buffer overflow. An attacker could leverage this vulnerability to execute code in the context of the current process.

Weakness

A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Affected Software

Potential Mitigations

• Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking.
• D3-SFCV (Stack Frame Canary Validation) from D3FEND [REF-1334] discusses canary-based detection in detail.
• Run or compile the software using features or extensions that randomly arrange the positions of a program’s executable and libraries in memory. Because this makes the addresses unpredictable, it can prevent an attacker from reliably jumping to exploitable code.
• Examples include Address Space Layout Randomization (ASLR) [REF-58] [REF-60] and Position-Independent Executables (PIE) [REF-64]. Imported modules may be similarly realigned if their default memory addresses conflict with other modules, in a process known as “rebasing” (for Windows) and “prelinking” (for Linux) [REF-1332] using randomly generated addresses. ASLR for libraries cannot be used in conjunction with prelink since it would require relocating the libraries at run-time, defeating the whole purpose of prelinking.
• For more information on these techniques see D3-SAOR (Segment Address Offset Randomization) from D3FEND [REF-1335].

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-979834.pdf
• https://us-cert.cisa.gov/ics/advisories/icsa-21-012-04
• https://www.zerodayinitiative.com/advisories/ZDI-21-055/
• https://www.zerodayinitiative.com/advisories/ZDI-21-076/
• https://cert-portal.siemens.com/productcert/pdf/ssa-979834.pdf
• https://us-cert.cisa.gov/ics/advisories/icsa-21-012-04
• https://www.zerodayinitiative.com/advisories/ZDI-21-055/
• https://www.zerodayinitiative.com/advisories/ZDI-21-076/