CVE-2006-0455
Description
gpgv in GnuPG before 1.4.2.1, when using unattended signature verification, returns a 0 exit code in certain cases even when the detached signature file does not carry a signature, which could cause programs that use gpgv to assume that the signature verification has succeeded. Note: this also occurs when running the equivalent command "gpg --verify".
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
GnuPG 1.x - Detached Signature Verification Bypass
source: https://www.securityfocus.com/bid/16663/info
GnuPG is affected by a detached signature verification-bypass vulnerability because it fails to properly notify scripts that an invalid detached signature was presented and that the verification process has failed.
Exploiting this issue allows attackers to bypass the signature-verification process used in some automated scripts. Depending on the use of GnuPG, this may result in a false sense of security, the installation of malicious packages, the execution of attacker-supplied code, or other attacks.
An example demonstrating this issue was provided:
fortune >x.txt
perl -e 'print "\xca"x"64"' >x.txt.sig
gpgv x.txt.sig x.txt
echo $?
This creates a file as well as an obviously invalid detached signature file. The file is then successfully validated by 'gpgv', since the exit status is '0'.OS impact
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 0 |
| sid | Fixed | 0 |
| forky | Fixed | 0 |
| bullseye | Fixed | 0 |
| bookworm | Fixed | 0 |
References
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.