CVE-2021-21412 [thi.ng/egf] Potential arbitrary code execution of `#gpg`-tagged property values
Attackers can execute arbitrary code via crafted GPG-tagged values in the thi.ng/egf npm library when decryption is enabled.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-21412?
CVE-2021-21412 is a medium-severity command injection vulnerability in thi-ng egf, published on 30 Mar 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Potential for arbitrary code execution in npm package @thi.ng/egf `#gpg`-tagged property values (only if `decrypt: true` option is enabled). PR with patch has been submitted and will has been released as of v0.4.0 By default the EGF parse functions do NOT attempt to decrypt values (since GPG only available in non-browser env). However, if GPG encrypted values are used/required: 1. Perform a regex search for `#gpg`-tagged values in the EGF source file/string and check for backtick (\`) chars in the encrypted value string 2. Replace/remove them or skip parsing if present.
Weakness: CWE-78
Which versions are affected by CVE-2021-21412?
2 open source packages ship an affected version, including @thi.ng/egf. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@thi.ng/egf npm | All versions | 0.4.0 |
@thi.ng/egf npm | All versions | 0.4.0 |
Products include \@Thi.ng\/Egf Project \@Thi.ng\/Egf.
How do I fix CVE-2021-21412?
Upgrade @thi.ng/egf to 0.4.0 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2021-21412 being exploited?
There is no known exploitation of CVE-2021-21412 in the wild and no public exploit code.
Sources
Also known as GHSA-rj44-gpjc-29r7.