CVE-2010-3872

A flaw was found in the mod_fcgid module of httpd. A malformed FastCGI response may result in a stack-based buffer overflow in the modules/fcgid/fcgid_bucket.c file in the fcgid_header_bucket_read() function, resulting in an application crash.

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

Name	Vendor	Start Version	End Version
Mod_fcgid	Apache	*	2.3.5 (including)
Mod_fcgid	Apache	2.3.1 (including)	2.3.1 (including)
Mod_fcgid	Apache	2.3.2 (including)	2.3.2 (including)
Mod_fcgid	Apache	2.3.3 (including)	2.3.3 (including)
Mod_fcgid	Apache	2.3.4 (including)	2.3.4 (including)
Libapache2-mod-fcgid	Ubuntu	dapper	*
Libapache2-mod-fcgid	Ubuntu	hardy	*
Libapache2-mod-fcgid	Ubuntu	karmic	*
Libapache2-mod-fcgid	Ubuntu	lucid	*
Libapache2-mod-fcgid	Ubuntu	maverick	*
Libapache2-mod-fcgid	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].

NVD	https://nvd.nist.gov/vuln/detail/CVE-2010-3872
CWE	https://cwe.mitre.org/data/definitions/121.html

Stack-based Buffer Overflow

Weakness

Affected Software

Potential Mitigations

References