virtualenv is a tool for creating isolated virtual python environments. From 21.14.9 until 21.14.13, the bash bin/activate script can copy an attacker-controlled --prompt value into PS1 without escaping dollar signs or backticks when both promptvars and POSIX mode are disabled during activation. Re-enabling promptvars, running set -o posix, or starting an interactive child bash that inherits the exported PS1 can then expand command substitution in the stored VIRTUAL_ENV_PROMPT value and execute commands as the user who activates the environment.
This issue is fixed in version 21.14.13.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
High
Difficult to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
Active
User action required
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/pypa/virtualenv/commit/3598e201f6f044e389136b2347a8a919ac03c…
security-advisories@github.com
https://github.com/pypa/virtualenv/pull/3466
security-advisories@github.com
https://github.com/pypa/virtualenv/releases/tag/21.14.13
security-advisories@github.com
https://github.com/pypa/virtualenv/security/advisories/GHSA-cx6f-vjhg-g3cc
security-advisories@github.com