Multiple directory traversal vulnerabilities in GNU C Library (aka glibc or libc6) before 2.20 allow context-dependent attackers to bypass F

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• gnu glibcup to 2.19 inclusive
• gnu glibc2.0
• gnu glibc2.0.1
• gnu glibc2.0.2
• gnu glibc2.0.3
• gnu glibc2.0.4
• gnu glibc2.0.5
• gnu glibc2.0.6
• gnu glibc2.1
• gnu glibc2.1.1
• gnu glibc2.1.1.6
• gnu glibc2.1.2
• gnu glibc2.1.3
• gnu glibc2.1.9
• gnu glibc2.10.1
• gnu glibc2.11
• gnu glibc2.11.1
• gnu glibc2.11.2
• gnu glibc2.11.3
• gnu glibc2.12

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Other highest-scoring records for the same primary product.

• CVE-2023-4911Glibc: buffer overflow in ld.so leading to privilege escalationKEV
  85Now
• CVE-2015-0235Heap-based buffer overflow in the __nss_hostname_digits_dots function in glibc 2.2, and other 2.x versions before 2.18, allows context-depen
  68This week
• CVE-2015-7547Multiple stack-based buffer overflows in the (1) send_dg and (2) send_vc functions in the libresolv library in the GNU C Library (aka glibc
  59Plan
• CVE-2024-2961The iconv() function in the GNU C Library versions 2.39 and older may overflow the output buffer passed to it by up to 4 bytes when converti
  55Plan
• CVE-2018-11236stdlib/canonicalize.c in the GNU C Library (aka glibc or libc6) 2.27 and earlier, when processing very long pathname arguments to the realpa
  41Plan
• CVE-2015-8779Stack-based buffer overflow in the catopen function in the GNU C Library (aka glibc or libc6) before 2.23 allows context-dependent attackers
  41Plan

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1const file = path.join(ROOT, req.query.name);2res.sendFile(file);

1const file = path.resolve(ROOT, req.query.name);2if (!file.startsWith(ROOT + path.sep)) {3  return res.sendStatus(400);4}5res.sendFile(file);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.