QID 983192

QID 983192: Python (pip) Security Update for ihatemoney (GHSA-67j9-c52g-w2q9)

Security update has been released for ihatemoney to fix the vulnerability.

Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

An authenticated member of one project can modify and delete members of another project, without knowledge of this other project's private code. This can be further exploited to access all bills of another project without knowledge of this other project's private code.

With the default configuration, anybody is allowed to create a new project. An attacker can create a new project and then use it to become authenticated and exploit this flaw. As such, the exposure is similar to an unauthenticated attack, because it is trivial to become authenticated.

CVSS V3 rated as Medium - 4.9 severity.

CVSS V2 rated as Medium - 4 severity.

Solution

```diff
ihatemoney/models.py | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ihatemoney/models.py b/ihatemoney/models.py
index fe7b519..5691c75 100644
--- a/ihatemoney/models.py
+++ b/ihatemoney/models.py
@@ -380,7 +380,7 @@ class Person(db.Model):
def get_by_name(self, name, project):
return (
Person.query.filter(Person.name == name)
- .filter(Project.id == project.id)
+ .filter(Person.project_id == project.id)
.one()
)

@@ -389,7 +389,7 @@ class Person(db.Model):
project = g.project
return (
Person.query.filter(Person.id == id)
- .filter(Project.id == project.id)
+ .filter(Person.project_id == project.id)
.one()
)

```Workaround:
To limit the impact, it is possible to disable public project creation by setting `ALLOW_PUBLIC_PROJECT_CREATION = False` in the configuration (see [documentation](https://ihatemoney.readthedocs.io/en/latest/configuration.html)). Existing users will still be able to exploit the flaw, but this will prevent an external attacker from creating a new project.

Vendor References

GHSA-67j9-c52g-w2q9 - github.com/advisories/GHSA-67j9-c52g-w2q9

CVEs related to QID 983192

CVE-2020-15120 |

Software Advisories

Advisory ID	Software	Component	Link
GHSA-67j9-c52g-w2q9	ihatemoney		github.com/advisories/GHSA-67j9-c52g-w2q9

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