Description Preview
The vulnerability affects TinyCC version 0.9.27 where compiling a crafted source file can trigger an 8-byte out-of-bounds write in the sym_pop function located in tccgen.c. This memory corruption vulnerability arises during the code generation process when handling symbol operations. The issue was disclosed in 2018.
Overview
An 8-byte out-of-bounds write vulnerability exists in TinyCC 0.9.27 during compilation of crafted source code, caused by a flaw in the sym_pop function of tccgen.c. This memory corruption could lead to instability or potential exploitation depending on the execution context. The disclosure occurred in 2018, highlighting the need for updates or patches to mitigate risk when using this version.
Remediation
- Upgrade to a TinyCC release that contains the fix. Check the upstream TinyCC repository or release notes for a patched version and update accordingly; recompile after upgrading.
- If upgrading is not feasible, apply a patch to tccgen.c sym_pop to add proper bounds checks and prevent writes beyond allocated memory, then recompile and perform regression tests.
- Isolate untrusted or user-supplied source code by running TinyCC inside a sandbox (e.g., container with restricted privileges, seccomp filters, and a read-only filesystem) to limit potential impact.
- Validate builds with safety checks (e.g., use AddressSanitizer/MemorySanitizer during testing) and run targeted regression tests that cover code generation paths involving symbol handling.
- Limit exposure of untrusted inputs to TinyCC in production environments and consider using a safer or more controlled compilation workflow for untrusted sources.
References
Industry ExposureMost to leastThis section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.
This section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.
- Accommodation & Food ServicesAccommodation & Food Services: Low
- Administrative, Support, Waste Management & Remediation ServicesAdministrative, Support, Waste Management & Remediation Services: Low
- Agriculture, Forestry Fishing & HuntingAgriculture, Forestry Fishing & Hunting: Low
- Arts, Entertainment & RecreationArts, Entertainment & Recreation: Low
- ConstructionConstruction: Low
- Educational ServicesEducational Services: Low
- Finance and InsuranceFinance and Insurance: Low
- Health Care & Social AssistanceHealth Care & Social Assistance: Low
- InformationInformation: Low
- Management of Companies & EnterprisesManagement of Companies & Enterprises: Low
- ManufacturingManufacturing: Low
- MiningMining: Low
- Other Services (except Public Administration)Other Services (except Public Administration): Low
- Professional, Scientific, & Technical ServicesProfessional, Scientific, & Technical Services: Low
- Public AdministrationPublic Administration: Low
- Real Estate Rental & LeasingReal Estate Rental & Leasing: Low
- Retail TradeRetail Trade: Low
- Transportation & WarehousingTransportation & Warehousing: Low
- UtilitiesUtilities: Low
- Wholesale TradeWholesale Trade: Low
