In PuTTY 0.68 through 0.80 before 0.81, biased ECDSA nonce generation allows an attacker to recover a user's NIST P-521 secret key via a quick attack in approximately 60 signatures. This is especially important in a scenario where an adversary is able to read messages signed by PuTTY or Pageant. The required set of signed messages may be publicly readable because they are stored in a public Git service that supports use of SSH for commit signing, and the signatures were made by Pageant through an agent-forwarding mechanism. In other words, an adversary may already have enough signature information to compromise a victim's private key, even if there is no further use of vulnerable PuTTY versions. After a key compromise, an adversary may be able to conduct supply-chain attacks on software maintained in Git. A second, independent scenario is that the adversary is an operator of an SSH server to which the victim authenticates (for remote login or file copy), even though this server is not fully trusted by the victim, and the victim uses the same private key for SSH connections to other services operated by other entities. Here, the rogue server operator (who would otherwise have no way to determine the victim's private key) can derive the victim's private key, and then use it for unauthorized access to those other services. If the other services include Git services, then again it may be possible to conduct supply-chain attacks on software maintained in Git. This also affects, for example, FileZilla before 3.67.0, WinSCP before 6.3.3, TortoiseGit before 2.15.0.1, and TortoiseSVN through 1.14.6.
References
Configurations
Configuration 1 (hide)
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Configuration 2 (hide)
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History
27 Mar 2025, 15:15
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20 Jun 2024, 19:15
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10 May 2024, 14:33
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| CWE | CWE-338 | |
| CPE | cpe:2.3:a:tortoisegit:tortoisegit:*:*:*:*:*:*:*:* cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:* cpe:2.3:a:winscp:winscp:*:*:*:*:*:*:*:* cpe:2.3:o:fedoraproject:fedora:40:*:*:*:*:*:*:* cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:* cpe:2.3:a:tigris:tortoisesvn:*:*:*:*:*:*:*:* cpe:2.3:a:filezilla-project:filezilla_client:*:*:*:*:*:*:*:* |
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| First Time |
Winscp
Fedoraproject Filezilla-project filezilla Client Putty Filezilla-project Tortoisegit tortoisegit Fedoraproject fedora Winscp winscp Tortoisegit Putty putty Tigris Tigris tortoisesvn |
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| References | () https://twitter.com/lambdafu/status/1779969509522133272 - Press/Media Coverage | |
| References | () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMJH7M663BVO3SY6MFAW2FAZWLLXAPRQ/ - Mailing List, Third Party Advisory | |
| References | () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MMHILY2K7HQGQRHOC375KRRG2M6625RD/ - Mailing List, Third Party Advisory | |
| References | () https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html - Release Notes, Vendor Advisory | |
| References | () https://news.ycombinator.com/item?id=40044665 - Issue Tracking | |
| References | () https://bugzilla.redhat.com/show_bug.cgi?id=2275183 - Issue Tracking | |
| References | () https://twitter.com/CCBalert/status/1780229237569470549 - Press/Media Coverage | |
| References | () https://tartarus.org/~simon/putty-snapshots/htmldoc/Chapter9.html#pageant-forward - Product | |
| References | () https://www.openwall.com/lists/oss-security/2024/04/15/6 - Mailing List, Third Party Advisory | |
| References | () https://tortoisegit.org - Third Party Advisory | |
| References | () https://git.tartarus.org/?h=c193fe9848f50a88a4089aac647fecc31ae96d27&p=simon/putty.git - Mailing List, Patch | |
| References | () http://www.openwall.com/lists/oss-security/2024/04/15/6 - Mailing List, Third Party Advisory | |
| References | () https://www.bleepingcomputer.com/news/security/putty-ssh-client-flaw-allows-recovery-of-cryptographic-private-keys/ - Press/Media Coverage | |
| References | () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WFDZBV7ZCAZ6AH3VCQ34SSY7L3J7VZXZ/ - Mailing List, Third Party Advisory | |
| References | () https://bugzilla.suse.com/show_bug.cgi?id=1222864 - Issue Tracking | |
| References | () https://securityonline.info/cve-2024-31497-critical-putty-vulnerability-exposes-private-keys-immediate-action-required/ - Press/Media Coverage | |
| References | () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZS3B37GNGWOOV7QU7B7JFK76U4TOP4V/ - Mailing List, Third Party Advisory | |
| References | () https://winscp.net/eng/news.php - Third Party Advisory | |
| References | () https://security-tracker.debian.org/tracker/CVE-2024-31497 - Third Party Advisory | |
| References | () https://github.com/daedalus/BreakingECDSAwithLLL - Third Party Advisory | |
| References | () https://filezilla-project.org/versions.php - Release Notes | |
| References | () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PUOTQVGC4DISVHQGSPUYGXO6TLDK65LA/ - Mailing List, Third Party Advisory | |
| References | () https://github.com/advisories/GHSA-6p4c-r453-8743 - Third Party Advisory | |
| References | () https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-p521-bias.html - Vendor Advisory | |
| References | () https://docs.ccv.brown.edu/oscar/connecting-to-oscar/ssh/ssh-agent-forwarding/key-generation-and-agent-forwarding-with-putty - Product | |
| References | () https://www.reddit.com/r/sysadmin/comments/1c4wmoj/putty_vulnerability_affecting_v068_to_v08/ - Press/Media Coverage | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.9 |
01 May 2024, 18:15
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25 Apr 2024, 06:15
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23 Apr 2024, 18:15
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18 Apr 2024, 02:15
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16 Apr 2024, 23:15
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16 Apr 2024, 13:24
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| New CVE |
Information
Published : 2024-04-15 20:15
Updated : 2025-03-27 15:15
NVD link : CVE-2024-31497
Mitre link : CVE-2024-31497
JSON object : View
Products Affected
fedoraproject
- fedora
tortoisegit
- tortoisegit
filezilla-project
- filezilla_client
winscp
- winscp
tigris
- tortoisesvn
putty
- putty
CWE
CWE-338
Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)