9.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2023-29404

CVE-2023-29404: The go command may execute arbitrary code at build time when using cgo. This may occur when...

The go command may execute arbitrary code at build time when using cgo. This may occur when running "go get" on a malicious module, or when running any other command which builds untrusted code. This is can by triggered by linker flags, specified via a "#cgo LDFLAGS" directive. The arguments for a number of flags which are non-optional are incorrectly considered optional, allowing disallowed flags to be smuggled through the LDFLAGS sanitization. This affects usage of both the gc and gccgo compilers.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2023-29404

CVE-2023-29404:

9.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

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Root Cause Analysis

The vulnerability lies in the improper sanitization of LDFLAGS directives used with cgo. The provided patch commit 356a419e2f811b65d227abcea1a346f8dcb154e0 modifies the regular expressions in validLinkerFlags within src/cmd/go/internal/work/security.go. These regexes are used by the checkLinkerFlags function in the same file to validate linker flags. The changes make the validation stricter, specifically for flags like -Wl,-O, -Wl,-e, and -Wl,-R, ensuring they are followed by mandatory arguments. This directly addresses the vulnerability described, where non-optional arguments were treated as optional, allowing flag smuggling. Therefore, cmd/go/internal/work.checkLinkerFlags is the function that, prior to the patch, would process and incorrectly sanitize the malicious input, making it the key vulnerable function in the runtime profile during exploitation.

Vulnerable functions

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WAF Rule

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Reasoning

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