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gitlabHttps://gitlab.com/gitlab-org/security-products/gemnasium-dbGITLAB-68032BD8C4250E297B25EFC133DDBF05
HistoryAug 30, 2022 - 12:00 a.m.

Denial of service through string value parsing

2022-08-3000:00:00
https://gitlab.com/gitlab-org/security-products/gemnasium-db
gitlab.com
12

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

Fuzz testing, by Ada Logics and sponsored by the CNCF, identified input to functions in the strvals package that can cause an out of memory panic. Out of memory panics cannot be recovered from. Applications that use functions from the strvals package in the Helm SDK can have a Denial of Service attack when they use this package and it panics.

Impact

The strvals package contains a parser that turns strings into Go structures. For example, the Helm client has command line flags like --set, --set-string, and others that enable the user to pass in strings that are merged into the values. The strvals package converts these strings into structures Go can work with. Some string inputs can cause array data structures to be created causing an out of memory panic.

Applications that use the strvals package in the Helm SDK to parse user supplied input can suffer a Denial of Service when that input causes a panic that cannot be recovered from.

The Helm Client will panic with input to --set, --set-string, and other value setting flags that causes an out of memory panic. Helm is not a long running service so the panic will not affect future uses of the Helm client.

Patches

This issue has been resolved in 3.9.4.

Workarounds

SDK users can validate strings supplied by users wonโ€™t create large arrays causing significant memory usage before passing them to the strvals functions.

For more information

Helmโ€™s security policy is spelled out in detail in our SECURITY document.

Credits

Disclosed by Ada Logics in a fuzzing audit sponsored by CNCF.

CPENameOperatorVersion
go/helm.sh/helm/v3ltv3.9.4

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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