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CVE-2026-44978: Check FIPS PDU padding value before use

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This commit is contained in:
matt335672
2026-05-06 11:40:08 +01:00
parent c8cd758283
commit e42951868b
1 changed files with 14 additions and 0 deletions
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libxrdp/xrdp_sec.c
+14
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@@ -1173,7 +1173,14 @@ xrdp_sec_recv_fastpath(struct xrdp_sec *self, struct stream *s)
/* remainder of TS_FP_INPUT_PDU */
in_uint8a(s, data_signature, sizeof(data_signature));
// Decrypt the packet, and subtract the padding length,
// after checking the validity
xrdp_sec_fips_decrypt(self, s->p, (int)(s->end - s->p));
if (pad > 7 || pad > (int)(s->end - s->p))
{
LOG(LOG_LEVEL_ERROR, "Bad padding for TS_FP_FIPS_INFO PDU");
return 1;
}
s->end -= pad;
if (!xrdp_sec_fips_check_sig(self, data_signature, 8,
s->p, (int)(s->end - s->p)))
@@ -1299,7 +1306,14 @@ xrdp_sec_recv(struct xrdp_sec *self, struct stream *s, int *chan)
"has unexpected version. Expected 1, actual %d", ver);
return 1;
}
// Decrypt the packet, and subtract the padding length,
// after checking the validity
xrdp_sec_fips_decrypt(self, s->p, (int)(s->end - s->p));
if (pad > 7 || pad > (int)(s->end - s->p))
{
LOG(LOG_LEVEL_ERROR, "Bad padding for TS_SECURITY_HEADER2 PDU");
return 1;
}
s->end -= pad;
if (!xrdp_sec_fips_check_sig(self, data_signature, 8,
s->p, (int)(s->end - s->p)))