Fallos del tipo CWE-61

173 resultados

Seguimento de ligações simbólicas em UNIX

Fraqueza onde uma aplicação segue uma ligação simbólica (symlink) sem validar adequadamente, permitindo que um atacante redirecione operações de arquivo para locais não intencionais. Um processo com privilégios elevados pode acabar lendo, escrevendo ou deletando arquivos críticos do sistema ao seguir um symlink malicioso criado pelo atacante.

Ejemplo

Um script de limpeza executado como root tenta remover arquivos em /tmp/cache sem verificar se são symlinks. Um atacante cria um symlink em /tmp/cache apontando para /etc/passwd, e o script acaba deletando a credencial do sistema. Ou um programa tenta criar um arquivo de log em /tmp sem checar se /tmp/app.log já é um symlink para /etc/shadow.

Cómo mitigar

Use funções seguras como open() com flags O_NOFOLLOW, lstat() em vez de stat(), ou valide o caminho com realpath() antes de operar. Em shell scripts, use [[ -L file ]] para detectar symlinks. Mantenha /tmp e /var/tmp com sticky bit (1777) e evite TOCTOU—verifique e acesse atomicamente ou use descritores de arquivo.

CVE-2024-47877MEDIUMExtract has insufficient checks allowing attacker to create symlinks outside the extraction directory.EPSS 0.5%CVE-2026-24047MEDIUM@backstage/cli-common has a possible `resolveSafeChildPath` Symlink Chain BypassEPSS 0.5%CVE-2026-55168MEDIUMRuntipi: Authenticated arbitrary file write via backup restore symlink plantingEPSS 0.5%CVE-2020-8019HIGHsyslog-ng: Local privilege escalation from new to root in %postEPSS 0.5%CVE-2026-63125CRITICALIncus vulnerable to root RCE via image backup.yaml symlinkEPSS 0.5%CVE-2025-68937CRITICALForgejo before 13.0.2 allows attackers to write to unintended files, and possibly obtain server shell access, because of mishandling of out-EPSS 0.5%CVE-2020-8014HIGHkopano-python-services: Local privilege escalation from kopano to root in kopano-spamd subpackageEPSS 0.5%CVE-2026-29203MEDIUMA chmod call in the cPanel Nova plugin's Cpanel::Nova::Connector follows symlinks, allowing setting root permissions on arbitrary system filEPSS 0.5%CVE-2026-27976HIGHZed Extension Sandbox Escape via Tar Symlink FollowingEPSS 0.5%CVE-2024-45418MEDIUMZoom Apps for macOS - Symbolic Link FollowingEPSS 0.5%CVE-2026-52811CRITICALGogs: UploadRepoFiles writes outside repo working tree via committed parent symEPSS 0.5%CVE-2025-24886HIGHpwn.college has Symlink LFI in Dojo reposEPSS 0.5%CVE-2025-10854HIGHSymlink Following in txtai leads to arbitrary file write when loading untrusted embedding indicesEPSS 0.5%CVE-2025-59829LOWClaude Code: Permission deny bypass is possible through symlinkEPSS 0.4%CVE-2021-25321HIGHarpwatch: Local privilege escalation from runtime user to rootEPSS 0.4%CVE-2021-25322MEDIUMpython-HyperKitty: hyperkitty-permissions.sh used during %post allows local privilege escalation from hyperkitty user to rootEPSS 0.4%CVE-2025-67487MEDIUMStatic Web Server is vulnerable to symbolic link Path TraversalEPSS 0.4%CVE-2026-25724LOWClaude Code Has Permission Deny Bypass Through Symbolic LinksEPSS 0.4%CVE-2026-41937HIGHVvveb < 1.0.8.3 Unrestricted File Upload RCE via Plugin UploadEPSS 0.4%CVE-2026-35525HIGHLiquidJS has a root restriction bypass for partial and layout loading through symlinked templatesEPSS 0.4%