The mysqlnd wire protocol parser reads fields out of server packets before checking that the packet still holds enough bytes for them. A malicious or compromised MySQL server can send a truncated packet and make the client read past the end of the packet buffer, which is undefined behaviour and can crash the process.
Weakness
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Php | Php | 8.2.0 (including) | 8.2.34 (excluding) |
| Php | Php | 8.3.0 (including) | 8.3.35 (excluding) |
| Php | Php | 8.4.0 (including) | 8.4.26 (excluding) |
| Php | Php | 8.5.0 (including) | 8.5.11 (excluding) |
| Red Hat Enterprise Linux 8 | RedHat | php:7.4-8100020261021081045.f7998665 | * |
| Red Hat Hardened Images | RedHat | php-main-8.5.11-2.hum1 | * |
| Php5 | Ubuntu | esm-infra-legacy/trusty | * |
| Php7.0 | Ubuntu | esm-infra-legacy/xenial | * |
| Php7.2 | Ubuntu | esm-infra/bionic | * |
| Php7.4 | Ubuntu | esm-infra/focal | * |
| Php8.1 | Ubuntu | jammy | * |
| Php8.3 | Ubuntu | noble | * |
| Php8.3 | Ubuntu | upstream | * |
| Php8.5 | Ubuntu | devel | * |
| Php8.5 | Ubuntu | resolute | * |
| Php8.5 | Ubuntu | stonking | * |
| Php8.5 | Ubuntu | upstream | * |
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].