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CVE-2020-11979: Code injection in Apache Ant

February 3, 2021 (updated September 27, 2025)

As mitigation for CVE-2020-1945 Apache Ant 1.10.8 changed the permissions of temporary files it created so that only the current user was allowed to access them. Unfortunately the fixcrlf task deleted the temporary file and created a new one without said protection, effectively nullifying the effort. This would still allow an attacker to inject modified source files into the build process.

References

  • github.com/advisories/GHSA-f62v-xpxf-3v68
  • github.com/apache/ant
  • github.com/apache/ant/commit/87ac51d3c22bcf7cfd0dc07cb0bd04a496e0d428
  • github.com/gradle/gradle/security/advisories/GHSA-j45w-qrgf-25vm
  • lists.apache.org/thread.html/r107ea1b1a7a214bc72fe1a04207546ccef542146ae22952e1013b5cc@%3Cdev.creadur.apache.org%3E
  • lists.apache.org/thread.html/r1dc8518dc99c42ecca5ff82d0d2de64cd5d3a4fa691eb9ee0304781e@%3Cdev.creadur.apache.org%3E
  • lists.apache.org/thread.html/r2306b67f20c24942b872b0a41fbdc9330e8467388158bcd19c1094e0@%3Cdev.creadur.apache.org%3E
  • lists.apache.org/thread.html/r4ca33fad3fb39d130cda287d5a60727d9e706e6f2cf2339b95729490@%3Cdev.creadur.apache.org%3E
  • lists.apache.org/thread.html/r5e1cdd79f019162f76414708b2092acad0a6703d666d72d717319305@%3Cdev.creadur.apache.org%3E
  • lists.apache.org/thread.html/raaeddc41da8f3afb1cb224876084a45f68e437a0afd9889a707e4b0c@%3Cdev.creadur.apache.org%3E
  • lists.apache.org/thread.html/rbfe9ba28b74f39f46ec1bbbac3bef313f35017cf3aac13841a84483a@%3Cdev.creadur.apache.org%3E
  • lists.apache.org/thread.html/rc3c8ef9724b5b1e171529b47f4b35cb7920edfb6e917fa21eb6c64ea%40%3Cdev.ant.apache.org%3E
  • lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AALW42FWNQ35F7KB3JVRC6NBVV7AAYYI
  • lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DYBRN5C2RW7JRY75IB7Q7ZVKZCHWAQWS
  • lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U3NRQQ7ECII4ZNGW7GBC225LVYMPQEKB
  • nvd.nist.gov/vuln/detail/CVE-2020-11979
  • security.gentoo.org/glsa/202011-18
  • www.oracle.com//security-alerts/cpujul2021.html
  • www.oracle.com/security-alerts/cpuApr2021.html
  • www.oracle.com/security-alerts/cpuapr2022.html
  • www.oracle.com/security-alerts/cpujan2021.html
  • www.oracle.com/security-alerts/cpujan2022.html
  • www.oracle.com/security-alerts/cpuoct2021.html

Code Behaviors & Features

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Affected versions

All versions before 1.10.9

Fixed versions

  • 1.10.9

Solution

Upgrade to version 1.10.9 or above.

Impact 7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Learn more about CVSS

Weakness

  • CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
  • CWE-94: Improper Control of Generation of Code ('Code Injection')

Source file

maven/org.apache.ant/ant/CVE-2020-11979.yml

Spotted a mistake? Edit the file on GitLab.

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